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1. High precision measurement of Compton scattering in the 5 GeV region

Author: M. Konchatnyi, D. McNulty, Ashot Gasparian, K. Hardy, S. Stepanyan, L. Guo, S. Kowalski, R. A. Miskimen, P. P. Martel, A. Sitnikov, E. Clinton, L. Benton, H. Y. Lu, D. Lawrence, L. Ye, Dipangkar Dutta, A. M. Micherdzinska, M. Wood, A. Shahinyan, R. Demirchyan, A. Deur, A. Ahmidouch, X. Li, S. R. Gevorkyan, S. Mtingwa, V. V. Mochalov, A. Dolgolenko, J. Feng, D. Kashy, B. Zihlmann, S. Overby, A. Evdokimov, Brian D. Milbrath, Y. Zhang, M. Levillain, W. Phelps, B. Morrison, D. I. Sober, P. Collins, I. Nakagawa, A. V. Glamazdin, H. Kang, Aron M. Bernstein, B. A. Mecking, L. Jiang, Wolfgang Korsch, G. Dzyubenko, Haiyan Gao, V. Baturin, M. M. Ito, V. Gyurjyan, K. Park, S. Taylor, P. L. Cole, Volker D. Burkert, S. Zhou, L. Gan, O. Kosinov, V. Goryachev, C. Salgado, I. Larin, N. Gevorkyan, A. Kolarkar, Andrey Vasiliev, J. Underwood, R. C. Minehart, A. Teymurazyan, G. V. Fedotov, G. Davidenko, W. A. Stephens, Dmitri Romanov, J. He, K. Baker, S. Danagoulian, E. Pasyuk, Friedrich Klein, E. L. Isupov, P. Ambrozewicz, D. P. Weygand, O. Korchin, A. Kubarovsky, Y. Prok, Barry Ritchie, V. P. Kubarovsky, V. Vishnyakov, M. Payen, P. Kingsberry, V. E. Tarasov, L. Ma, D. Protopopescu, D. Rimal, D. S. Dale, V. Matveev, M. Khandaker, R.S. Pedroni, M. Gabrielyan, and M. A. Kubantsev
Subjects: Nuclear and High Energy Physics, Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Electron, 01 natural sciences, 7. Clean energy, Nuclear Theory (nucl-th), Nuclear physics, Cross section (physics), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Radiative transfer, Nuclear Experiment (nucl-ex), Photon beam, 010306 general physics, Nuclear Experiment, Nuclear theory, Physics, 010308 nuclear & particles physics, Compton scattering, lcsh:QC1-999, High Energy Physics - Phenomenology, Beam energy, Beam (structure), lcsh:Physics
Abstract: The cross section of atomic electron Compton scattering $\gamma + e \rightarrow \gamma^\prime + e^\prime $ was measured in the 4.40--5.475 GeV photon beam energy region by the {\em PrimEx} collaboration at Jefferson Lab with an accuracy of 2\% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV., Comment: 6 pages, 4 figures
Published: 2019

2. High precision photon flux determination for photon tagging experiments

Author: R. Demirchyan, B. A. Mecking, D. Lawrence, Brian D. Milbrath, A. Evdokimov, Y. Prok, Barry Ritchie, P. P. Martel, K. Hardy, Rolf Ent, P. Collins, A. Kolarkar, M. A. Kubantsev, J. Underwood, R. C. Minehart, J. J. He, S. Danagoulian, D. Kashy, A. Deur, D. S. Dale, A. Ahmidouch, A. Dolgolenko, P. Ambrozewicz, Andrey Vasiliev, A. V. Glamazdin, R.S. Pedroni, A. Korchin, L. Jiang, S. Kowalski, A. Shahinyan, D. McNulty, S. Overby, A. Asratyan, V. V. Mochalov, M. Gabrielyan, L. Benton, I. Nakagawa, M. Khandaker, X. Li, Ashot Gasparian, G. Dzyubenko, I. Larin, S. Stepanyan, Volker D. Burkert, Wolfgang Korsch, M. M. Ito, R. A. Miskimen, A. Sitnikov, E. Clinton, E. Pasyuk, O. Kosinov, C. Salgado, K. Baker, V. Goryachev, Viktor Matveev, V. P. Kubarovsky, D. I. Sober, J. Feng, P. L. Cole, W. Stevens, S. Zhou, A. Teymurazyan, M. Wood, V. Vishnyakov, M. Payen, L. Gan, M. Konchatnyi, and G. Davidenko
Subjects: Physics, Nuclear and High Energy Physics, Photon, Spectrometer, Astrophysics::High Energy Astrophysical Phenomena, Bremsstrahlung, Flux, Photon energy, Particle detector, Nuclear physics, Measuring instrument, Nuclear Experiment, Absorption (electromagnetic radiation), Instrumentation
Abstract: The Jefferson Laboratory PrimEx Collaboration has developed and implemented a method to control the tagged photon flux in photoprocluction experiments at the 1% level over the photon energy range from 4.9 to 5.5 GeV. This method has been successfully implemented in a high precision measurement of the neutral pion lifetime. Here, we outline the experimental equipment and the analysis techniques used to accomplish this. These include the use of a total absorption counter for absolute flux calibration, a pair spectrometer for online relative flux monitoring, and a new method for post-bremsstrahlung electron counting. (C) 2014 Elsevier B.V. All rights reserved.
Published: 2014

3. The CLAS forward electromagnetic calorimeter

Author: L. C. Smith, R.A. Demirchyan, W. A. Stephens, S. Stepanyan, M. Amarian, Geram Asryan, A. Coleman, Kevin Beard, R. C. Minehart, Yuri Efremenko, H. Mkrtchan, H. O. Funsten, Hovanes Egiyan, V. Gavrilov, W. K. Brooks, Carl Zorn, Tom Carstens, R.M. Marshall, Youri Sharabian, Volker D. Burkert, Mavrik Ohandjanyan, B. A. Mecking, K. S. Egiyan, Kevin Giovanetti, and T.Y. Tung
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Scintillator, Radiation length, Particle detector, Particle identification, Calorimeter, Nuclear physics, Scintillation counter, Neutron detection, High Energy Physics::Experiment, Nuclear Experiment, Instrumentation
Abstract: The CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab utilizes six iron-free superconducting coils to provide an approximately toroidal magnetic field. The six sectors are instrumented individually to form six independent spectrometers. The forward region (8deg < (theta) < 45deg) of each sector is equipped with a lead-scintillator electromagnetic sampling calorimeter (EC), 16 radiation lengths thick, using a novel triangular geometry with stereo readout. With its good energy and position resolution, the EC is used to provide the primary electron trigger for CLAS. It is also used to reject pions, reconstruct pi-0 and eta decays and detect neutrons, This paper treats the design, construction and performance of the calorimeter.
Published: 2001

4. New Measurement of the π0 radiative decay width

Author: A. Kolarkar, M. Khandaker, A. V. Glamazdin, M. Gabrielyan, D. Kashy, R. A. Miskimen, G. Dzyubenko, I. Larin, M. A. Kubantsev, L. Jiang, T. E. Rodrigues, V. Vishnyakov, M. Payen, X. Li, A. Evdokimov, D. McNulty, G. Davidenko, W. A. Stephens, M. Konchatnyi, I. Nakagawa, S. Danagoulian, E. Pasyuk, J. He, S. Mtingwa, P. Ambrozewicz, L. Gan, A. Dolgolenko, J. Feng, S. Kowalski, P. Kingsberry, J. Underwood, R. C. Minehart, P. Collins, L. Benton, A. Deur, P. L. Cole, D. Lawrence, V. Gyurjyan, M. Wood, V. P. Kubarovsky, A. Ahmidouch, B. A. Mecking, Wolfgang Korsch, S. Gevorkyan, P. P. Martel, Aron M. Bernstein, Ashot Gasparian, V. Goryachev, M. M. Ito, V. V. Mochalov, A. Sitnikov, Y. Prok, Barry Ritchie, E. Clinton, D. S. Dale, V. Matveev, K. Baker, A. Teymurazyan, C. Salgado, S. Overby, Andrey Vasiliev, K. Hardy, Brian D. Milbrath, Rolf Ent, R.S. Pedroni, R. Demirchyan, A. Korchin, A. Shahinyan, A. Asratyan, S. Zhou, Volker D. Burkert, S. Stepanyan, and D. I. Sober
Subjects: Physics, Meson, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Carbon-12, General Physics and Astronomy, Particle Data Group, Elementary particle, 01 natural sciences, 7. Clean energy, Massless particle, Nuclear physics, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract: High precision measurements of the differential cross sections for $\pi^0$ photoproduction at forward angles for two nuclei, $^{12}$C and $^{208}$Pb, have been performed for incident photon energies of 4.9 - 5.5 GeV to extract the ${\pi^0 \to \gamma\gamma}$ decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The ${\pi^0 \to \gamma\gamma}$ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is $\Gamma{(\pi^0 \to \gamma\gamma)} = 7.82 \pm 0.14 ~({\rm stat.}) \pm 0.17 ~({\rm syst.}) ~{\rm eV}$. With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current PDG average of this fundamental quantity and it is consistent with current theoretical predictions., Comment: 4 pages, 5 figures
Published: 2010

5. A drift chamber system for a toroidal detector

Author: B. B. Niczyporuk, F. Barbosa, C. Hutton, D. Tilles, A. Yegneswaran, J.E. O'Meara, W. Tuzel, S. Christo, M. D. Mestayer, C. Cuevas, D. Joyce, G. Doolittle, D.C. Doughty, and B. A. Mecking
Subjects: Physics, Nuclear and High Energy Physics, Toroid, Scattering, business.industry, Hexagonal cell, Detector, chemistry.chemical_element, Magnetic field, Optics, chemistry, Wire tension, business, Instrumentation, Helium
Abstract: We present design details for drift chambers to be used in the CLAS detector at CEBAF. Novel features include nonparallel endplates fabricated from composite materials, a gas mixture which includes helium to reduce multiple scattering, low wire tension, and a hexagonal cell layout. Magnetic field strength in the active region ranges from 0 to 2 T, and wire length varies from 10 to 300 cm. We discuss specific construction details for the outer drift chambers.
Published: 1992

6. Precise Measurement of the Neutron Magnetic Form FactorGMnin the Few-GeV2Region

Author: R. J. Feuerbach, J. P. Cummings, L. C. Smith, E. Munevar, R. De Masi, D. Keller, M. Kossov, B. S. Ishkhanov, I. Popa, K. S. Egiyan, G. Ricco, K. Mikhailov, L. Cheng, M. Khandaker, M. Garçon, J. Shaw, Michael Wood, P. Nadel-Turonski, Nikolay Shvedunov, M. R. Niroula, K. Hafidi, R. Nasseripour, S. McAleer, Friedrich Klein, B. P. Quinn, Brian Raue, V. S. Serov, L. Casey, F. X. Girod, Susan Taylor, Marco A. Huertas, M. Lowry, V. Sapunenko, D. P. Watts, L. C. Dennis, B. E. Bonner, Hartmuth Arenhövel, Dinko Pocanic, H. Egiyan, R. G. Fersch, H. Avakian, D. Doughty, B. B. Niczyporuk, G. S. Adams, S. Park, D. Sharov, N. Kalantarians, P. L. Cole, Sylvain Bouchigny, Sabine Jeschonnek, R. C. Minehart, Kei Moriya, D. Heddle, P. Rossi, J. Lachniet, H. G. Juengst, C. A. Meyer, N. Pivnyuk, K. Joo, W. J. Briscoe, B. L. Berman, A. Tkabladze, G. V. Fedotov, E. Pasyuk, D. Rowntree, A. Coleman, L. M. Qin, M. Y. Gabrielyan, S. E. Kuhn, S. A. Dytman, V. Crede, Y. Ilieva, J. R. Calarco, T. Mineeva, J. W. Price, M. J. Amaryan, C. Paterson, S. Strauch, M. MacCormick, A.V. Stavinsky, M. Klusman, I. Hleiqawi, V. P. Kubarovsky, K. P. Adhikari, S. L. Careccia, A. Empl, L. El Fassi, O. Pogorelko, B. Moreno, D. P. Weygand, J. Salamanca, R. Suleiman, M. E. McCracken, Elton Smith, K. L. Giovanetti, B. Asavapibhop, G. V. O'Rielly, Tsutomu Mibe, Larry Weinstein, Z. W. Zhao, J. W C McNabb, D. J. Tedeschi, D. Protopopescu, D. G. Jenkins, Barry Ritchie, M. Anghinolfi, James Mueller, S. Malace, S. A. Morrow, P. Rubin, I. Bedlinskiy, G. S. Mutchler, Konstantin Stopani, S. Pozdniakov, V. Gyurjyan, M. M. Ito, C. Djalali, Y. G. Sharabian, G. Rosner, T. Kageya, K. Livingston, D. S. Dale, X. Wei, R. Dickson, V. Kuznetsov, C. E. Hyde-Wright, H. Denizli, N. Guler, N. A. Baltzell, P. Mattione, K. A. Griffioen, M. S. Saini, A. V. Skabelin, P. Dragovitsch, J. Zhang, S. Barrow, E. De Sanctis, S. Niccolai, J. T. Goetz, E. Polli, H. Bagdasaryan, R. A. Miskimen, J. D. Kellie, B. McKinnon, Sergey Kuleshov, M. Bektasoglu, J. Hardie, M. Nozar, W. Kim, Laird Kramer, G. Niculescu, D. I. Sober, D. Branford, M. Guidal, R. A. Schumacher, H. Hakobyan, M. Mirazita, P. Khetarpal, C. Hanretty, J. M. Laget, M. Holtrop, Victor Mokeev, L. Graham, J. R. Johnstone, N. Gevorgyan, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, A. Daniel, K. Beard, Kalvir S. Dhuga, S. Bültmann, A. I. Ostrovidov, J. Yun, D. Cords, V. Batourine, T. A. Forest, A. Yegneswaran, A. C S Lima, A. Sandorfi, K. Park, R. Fatemi, S. Stepanyan, A. V. Vlassov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, J. Pierce, Avraham Klein, B. Zhao, J. Langheinrich, R. De Vita, A. Fradi, S. S. Stepanyan, S. A. Philips, William Brooks, N. Markov, P. Konczykowski, B. E. Stokes, J. J. Manak, S. Anefalos Pereira, G. E. Dodge, H. Y. Lu, N. Dashyan, Maryam Moteabbed, P. V. Degtyarenko, K. V. Dharmawardane, I. Niculescu, D. Lawrence, D. Schott, F. W. Hersman, M. Battaglieri, N. Baillie, P. Stoler, K. Hicks, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, R. Bradford, B. A. Mecking, K. Lukashin, E. Wolin, Gerard Gilfoyle, M. Guillo, D. Sokhan, W. Gohn, N. Hassall, M. Bellis, E. Golovatch, J. P. Ball, J. Hu, Y. Prok, D. S. Carman, S. Dhamija, M. D. Mestayer, L. Elouadrhiri, I. I. Strakovsky, E. L. Isupov, R. W. Gothe, G. Gavalian, S. Tkachenko, A. Deur, Michael L. Williams, J. Kuhn, N. Benmouna, J. P. Santoro, Andrei Afanasev, M. Ripani, D. G. Crabb, K. Y. Kim, Roy Thompson, Cynthia Marie Hadjidakis, S. Boiarinov, Michael Dugger, B. M. Preedom, Douglas Higinbotham, M. Yurov, Lorenzo Zana, H. S. Jo, C. Bookwalter, C. Salgado, Kwangsoo Kim, G. Riccardi, P. Eugenio, A. Starostin, M. Taiuti, Michael Vineyard, and P. Collins
Subjects: Physics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, General Physics and Astronomy, Scintillator, 7. Clean energy, 01 natural sciences, Nuclear physics, Dipole, Deuterium, 0103 physical sciences, Magnetic form factor, Neutron detection, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering
Abstract: The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic calorimeters and time-of-flight scintillators at two beam energies. The dipole parametrization gives a good description of the data.
Published: 2009

7. Search for the Photoexcitation of Exotic Mesons in theπ+π+π−System

Author: M. Nozar, C. Salgado, D. P. Weygand, L. Guo, G. Adams, Ji Li, P. Eugenio, M. J. Amaryan, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, L. Casey, A. Cazes, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. P. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, R. Fatemi, G. Fedotov, R. J. Feuerbach, T. A. Forest, A. Fradi, H. Funsten, M. Garçon, G. Gavalian, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. D. Rubin, F. Sabatié, J. Salamanca, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, B. Zhao, and Z. W. Zhao
Subjects: Quantum chromodynamics, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Bremsstrahlung, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Isobar, Production (computer science), 010306 general physics, Spin-½
Abstract: A search for exotic mesons in the $$\pi^{+}\pi^{+}\pi^{-}$$ system photoproduced by the charge exchange reaction $$\gamma p\to \pi^{+}\pi^{+}\pi^{-}(n)$$ was carried out by the CLAS collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A Partial Wave Analysis (PWA) was performed on a sample of 83,000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic $$J^{PC} = 1^{-+}$$ resonant state in the 1 to 2 GeV mass range. Our PWA analysis, based on the isobar model, shows production of the $$a_{2}(1320)$$ and the $$\pi_{2}(1670)$$ mesons, but no evidence for the $$a_{1}(1260)$$, nor the $$\pi_{1}(1600)$$ exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic $$\pi_1(1600)$$ cross section, less than 2% of the $a_2(1320)
Published: 2009

8. Measurement of Directf0(980)Photoproduction on the Proton

Author: S. Park, Sylvain Bouchigny, V. Crede, J. R. Calarco, E. Wolin, C. E. Hyde, R. A. Schumacher, V. Sapunenko, Dinko Pocanic, P. Nadel-Turonski, L. Casey, V. Mokeev, D. Lawrence, J. P. Cummings, H. G. Juengst, B. E. Stokes, Cynthia Marie Hadjidakis, J. P. Ball, D. S. Carman, A. Fradi, A. V. Vlassov, P. Konczykowski, M. J. Amaryan, S. Dhamija, Michael Dugger, K. Livingston, D. S. Dale, T. Lee, Maryam Moteabbed, M. Kossov, S. E. Kuhn, L. Graham, Ashot Gasparian, B. B. Niczyporuk, C. I O Gordon, M. MacCormick, R. W. Gothe, Z. W. Zhao, R. Dickson, N. Gevorgyan, T. Kageya, H. Avakian, I. Hleiqawi, K. V. Dharmawardane, A.V. Stavinsky, J. Donnelly, G. Asryan, N. Pivnyuk, D. G. Crabb, J. Kuhn, M. E. McCracken, R. De Vita, S. Strauch, E. Clinton, S. Bültmann, S. L. Careccia, D. G. Jenkins, O. P. Dzyubak, D. P. Watts, H. Egiyan, Gerard Gilfoyle, G. Ricco, Lorenzo Zana, J. P. Santoro, C. Tur, L. Gan, Tsutomu Mibe, W. Gohn, T. A. Forest, D. J. Tedeschi, N. Markov, D. Sokhan, D. Sharov, W. Kim, S. Anefalos Pereira, S. Stepanyan, G. Niculescu, M. Yurov, J. Goett, R. A. Miskimen, I. Bedlinskiy, B. McKinnon, M. Y. Gabrielyan, J. Pierce, K. L. Giovanetti, F. X. Girod, Sergey Kuleshov, Avraham Klein, Shifeng Chen, N. Guler, E. Golovatch, Friedrich Klein, Larry Weinstein, N. A. Baltzell, G. E. Dodge, P. Khetarpal, K. A. Stopani, Brian Raue, D. Keller, H. Y. Lu, M. Nozar, D. Branford, J. Salamanca, H. S. Jo, C. Bookwalter, E. De Sanctis, L. Lesniak, G. Riccardi, J. M. Laget, V. V. Mochalov, P. Mattione, K. A. Griffioen, M. Aghasyan, X. Wei, V. Kuznetsov, M. S. Saini, P. V. Degtyarenko, A. I. Ostrovidov, D. I. Sober, A. Sandorfi, K. Park, P. Eugenio, Adam P. Szczepaniak, V. Batourine, C. Hanretty, A. Starostin, M. Guidal, N. Dashyan, M. Taiuti, W. J. Briscoe, E. Pasyuk, H. Hakobyan, S. A. Morrow, G. Rosner, J. T. Goetz, M. Mirazita, C. Djalali, Paolo Rossi, M. Khandaker, L. Bibrzycki, I. Niculescu, J. Lachniet, A. Tkabladze, Y. Ilieva, J. W. Price, M. Holtrop, R. A. Niyazov, Elton Smith, D. G. Ireland, A. Daniel, A. Teymurazyan, I. I. Strakovsky, G. Gavalian, N. Hassall, M. Bellis, P. Ambrozewicz, P. Collins, B. Zhao, R. De Masi, S. Tkachenko, D. Schott, M. Ripani, D. Doughty, P. Stoler, J. J. Melone, S. Niccolai, Z. Krahn, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, C. Salgado, N. Benmouna, J. Langheinrich, S. S. Stepanyan, D. Heddle, J. D. Kellie, A. Deur, N. Baillie, T. Mineeva, S. Malace, Mark W. Paris, J. R. Johnstone, Hall Crannell, M. Osipenko, V. P. Kubarovsky, Y. G. Sharabian, Laird Kramer, L. Cheng, W. K. Brooks, J. Hardie, F. W. Hersman, R. S. Hakobyan, L. Guo, M. Ungaro, B. Moreno, O. Pogorelko, G. S. Mutchler, K. Hicks, Nikolay Shvedunov, D. Protopopescu, B. L. Berman, K. S. Egiyan, L. El Fassi, S. Pozdniakov, M. Garçon, Michael Wood, K. Mikhailov, K. Hafidi, V. S. Serov, M. Battaglieri, N. Kalantarians, R. Bradford, B. A. Mecking, R. Nasseripour, K. Joo, A. Yegneswaran, Michael Vineyard, V. Gyurjyan, J. Zhang, H. Bagdasaryan, L. Todor, R. G. Fersch, C. Paterson, Ji Li, P. L. Cole, M. D. Mestayer, E. L. Isupov, Michael L. Williams, M. M. Ito, S. Boiarinov, F. Sabatié, L. C. Smith, E. Munevar, B. S. Ishkhanov, M. R. Niroula, M. Lowry, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, K. P. Adhikari, D. P. Weygand, O. Glamazdin, Alexei V. Klimenko, Y. Prok, Barry Ritchie, and I. Nakagawa
Subjects: Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, General Physics and Astronomy, Resonance, 01 natural sciences, 7. Clean energy, Nuclear physics, Particle decay, Pion, 0103 physical sciences, 010306 general physics, Nucleon
Abstract: We report on the results of the first measurement of exclusive f{sub 0}(980) meson photoproduction on protons for E{sub {gamma}}=3.0-3.8 GeV and -t=0.4-1.0 GeV{sup 2}. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the {pi}{sup +}{pi}{sup -} channel by performing a partial wave analysis of the reaction {gamma}p{yields}p{pi}{sup +}{pi}{sup -}. Clear evidence of the f{sub 0}(980) meson was found in the interference between P and S waves at M{sub {pi}{sup +}}{sub {pi}{sup -}}{approx}1 GeV. The S-wave differential cross section integrated in the mass range of the f{sub 0}(980) was found to be a factor of about 50 smaller than the cross section for the {rho} meson. This is the first time the f{sub 0}(980) meson has been measured in a photoproduction experiment.
Published: 2009

9. Electroproduction ofpπ+π−off protons at0.2<Q2<0.6GeV2and1.3<W<1.57GeV with the CLAS detector

Author: P. Stoler, N. A. Baltzell, V. Crede, K. Hicks, J. R. Calarco, K. A. Griffioen, K. S. Egiyan, J. D. Kellie, C. Paterson, H. Denizli, S. Strauch, M. Klusman, M. Guidal, J. W C McNabb, K. Livingston, Nikolay Shvedunov, G. S. Mutchler, R. Dickson, Shifeng Chen, M. Osipenko, M. Holtrop, G. E. Dodge, V. Gyurjyan, P. Eugenio, P. V. Degtyarenko, Laird Kramer, J. Donnelly, G. Asryan, C. E. Hyde, O. P. Dzyubak, M. Taiuti, Marco A. Huertas, G. Rosner, T. Mineeva, J. Zhang, N. Guler, F. X. Girod, J. Langheinrich, I. Niculescu, V. Batourine, B. Carnahan, R. A. Niyazov, E. De Sanctis, Hovhannes Baghdasaryan, Sylvain Bouchigny, L. C. Smith, J. T. Goetz, J. P. Cummings, D. Lawrence, A.V. Stavinsky, B. B. Niczyporuk, P. Corvisiero, L. Guo, P. Rossi, B. S. Ishkhanov, M. Ungaro, R. A. Miskimen, B. McKinnon, H. G. Juengst, Susan Taylor, E. Wolin, D. I. Sober, J. W. Price, Konstantin Stopani, D. J. Tedeschi, V. Sapunenko, N. Pivnyuk, K. Mikhailov, Y. Prok, D. Branford, Dinko Pocanic, M. Mirazita, H. Egiyan, E. Golovatch, William Brooks, J. M. Laget, L. Todor, S. E. Kuhn, R. Fatemi, J. P. Ball, I. Bedlinskiy, Sergey Kuleshov, Rakhsha Nasseripour, Hall Crannell, M. Bektasoglu, A. Yegneswaran, B. E. Stokes, D. Protopopescu, S. Pozdniakov, A. V. Vlassov, K. V. Dharmawardane, D. S. Carman, G. S. Adams, C. Tur, T. Lee, G. Ricco, K. Joo, J. Kuhn, D. G. Jenkins, A. I. Ostrovidov, Roy Thompson, G. V. O'Rielly, K. Park, R. De Vita, R. A. Schumacher, Elton Smith, R. J. Feuerbach, Victor Mokeev, J. Shaw, Y. Ilieva, S. A. Morrow, C. Djalali, G. Niculescu, M. Anghinolfi, Michael Wood, D. G. Ireland, D. G. Crabb, M. D. Mestayer, P. Coltharp, Friedrich Klein, James Mueller, N. Dashyan, S. Bültmann, T. A. Forest, Brian Raue, G. Gavalian, N. Hassall, M. Bellis, M. Guillo, S. Stepanyan, S. Niccolai, M. M. Ito, E. L. Isupov, Volker D. Burkert, J. Pierce, Avraham Klein, A. S. Biselli, P. D. Rubin, J. Hardie, J. Hu, P. Ambrozewicz, M. Battaglieri, V. S. Serov, L. C. Dennis, Michael L. Williams, B. E. Bonner, R. Bradford, B. A. Mecking, S. Tkachenko, N. Benmouna, F. Sabatié, Y. G. Sharabian, H. Avakian, Kwangsoo Kim, C. Butuceanu, M. Ripani, N. Markov, S. Boiarinov, D. Sharov, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, E. Pasyuk, S. A. Dytman, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, A. Tkabladze, G. V. Fedotov, Michael Vineyard, D. P. Weygand, Alexei V. Klimenko, V. P. Kubarovsky, Barry Ritchie, O. Pogorelko, Lorenzo Zana, J. P. Santoro, H. S. Jo, D. Doughty, C. Salgado, M. E. McCracken, P. Nadel-Turonski, Tsutomu Mibe, M. Khandaker, N. Gevorgyan, Z. Krahn, J. Lachniet, N. Baillie, Gerard Gilfoyle, D. Rowntree, M. J. Amaryan, R. W. Gothe, I. Hleiqawi, K. Y. Kim, S. L. Careccia, P. L. Cole, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, F. W. Hersman, and W. Kim
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Pion, Meson, Hadron, Elementary particle, Invariant mass, Sensitivity (control systems), Nucleon
Abstract: This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process ep{yields}e{sup '}p{pi}{sup +}{pi}{sup -}. The data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the as yet unexplored kinematic region of photon virtuality 0.2
Published: 2009

10. Measurement ofep→epπ0beam spin asymmetries above the resonance region

Author: R. De Masi, M. Garçon, B. Zhao, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. Ball, J. P. Ball, N. A. Baltzell, V. Batourine, M. Battaglieri, I. Bedlinskiy, M. Bellis, N. Benmouna, B. L. Berman, P. Bertin, A. S. Biselli, L. Blaszczyk, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, L. Casey, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Crabb, V. Crede, N. Dashyan, E. De Sanctis, R. De Vita, P. V. Degtyarenko, A. Deur, K. V. Dharmawardane, R. Dickson, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, M. Dugger, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, G. Feldman, A. Fradi, H. Funsten, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, N. Guler, L. Guo, V. Gyurjyan, K. Hafidi, H. Hakobyan, C. Hanretty, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, M. Mazouz, B. McKinnon, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, B. Michel, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, M. Nozar, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, Y. Prok, D. Protopopescu, B. A. Raue, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, F. Sabatié, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, A. Tkabladze, S. Tkachenko, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, E. Voutier, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, and Z. W. Zhao
Subjects: Physics, Nuclear and High Energy Physics, Photon, Spectrometer, 010308 nuclear & particles physics, media_common.quotation_subject, Parton, 01 natural sciences, Asymmetry, Nuclear physics, Formalism (philosophy of mathematics), Amplitude, 0103 physical sciences, Cathode ray, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, media_common
Abstract: The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin(phi) function and their amplitudes are extracted. Overall, they are of the order of 0.04 - 0.11 and roughly independent of t. This is the signature of a non-zero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.
Published: 2008

11. Cross sections and beam asymmetries fore→p→enπ+in the nucleon resonance region for1.7⩽Q2⩽4.5GeV2

Author: R. Fatemi, A. V. Vlassov, T. Lee, H. G. Juengst, A. Fradi, R. De Vita, A.V. Stavinsky, N. Markov, N. Hassall, B. Zhao, D. J. Tedeschi, S. Park, Sylvain Bouchigny, K. Hafnaoui, K. Livingston, D. S. Dale, G. Rosner, R. Nasseripour, I. Bedlinskiy, S. Anefalos Pereira, P. Rossi, E. Wolin, R. Dickson, Ji Li, J. P. Ball, Y. Prok, F. W. Hersman, V. Kuznetsov, J. P. Cummings, V. Sapunenko, Dinko Pocanic, C. Hanretty, N. Guler, S. McAleer, F. X. Girod, L. Blaszczyk, D. G. Ireland, V. Crede, S. E. Kuhn, M. Osipenko, F. Sabatié, J. Lachniet, H. Denizli, A. Tkabladze, J. R. Johnstone, M. Kossov, J. R. Calarco, D. G. Crabb, D. Rowntree, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, A. I. Ostrovidov, A. C S Lima, R. Suleiman, I. Popa, G. S. Mutchler, L. Guo, G. E. Dodge, H. Y. Lu, M. Ungaro, D. Doughty, M. D. Mestayer, S. Niccolai, E. De Sanctis, Volker D. Burkert, A. S. Biselli, E. L. Isupov, C. Tur, M. Guillo, D. Heddle, W. Gohn, M. Guidal, J. Hardie, Z. Krahn, J. Kuhn, P. L. Cole, S. Barrow, Elton Smith, Friedrich Klein, M. Yurov, Kalvir S. Dhuga, Michael L. Williams, P. V. Degtyarenko, N. Baillie, M. Anghinolfi, James Mueller, A. V. Skabelin, L. Todor, D. Protopopescu, S. Mehrabyan, D. I. Sober, S. Pozdniakov, M. Garçon, J. Yun, D. Cords, S. S. Stepanyan, S. Boiarinov, P. D. Rubin, Y. G. Sharabian, A. Yegneswaran, R. A. Miskimen, Brian Raue, B. McKinnon, Atilla Gonenc, R. C. Minehart, Kei Moriya, C. A. Meyer, J. W. Price, T. Takeuchi, M. Holtrop, I. Niculescu, C. Bookwalter, G. V. Fedotov, W. Kim, G. Niculescu, G. Gavalian, Laird Kramer, G. Riccardi, D. Lawrence, Baile Zhang, Shifeng Chen, S. Dhamija, J. Shaw, P. Corvisiero, S. Tkachenko, L. El Fassi, D. Branford, Michael Wood, R. De Masi, B. E. Stokes, K. Hafidi, C. Butuceanu, D. Keller, D. Schott, G. S. Adams, N. A. Baltzell, V. Gyurjyan, N. Benmouna, M. Ripani, K. Joo, N. Dashyan, P. Mattione, D. P. Weygand, M. S. Saini, M. Mirazita, J. M. Laget, V. S. Serov, R. W. Gothe, Y. Ilieva, N. Gevorgyan, Michael Vineyard, J. Zhang, P. Nadel-Turonski, Alexei V. Klimenko, L. Cheng, Tsutomu Mibe, B. M. Preedom, L. Elouadrhiri, J. Langheinrich, K. Y. Kim, Nikolay Shvedunov, J. T. Goetz, E. Polli, H. Bagdasaryan, Lorenzo Zana, J. P. Santoro, Barry Ritchie, S. A. Philips, M. Khandaker, P. Eugenio, M. Taiuti, G. V. O'Rielly, Z. W. Zhao, I. I. Strakovsky, P. Stoler, J. D. Kellie, S. A. Morrow, V. P. Kubarovsky, V. Mokeev, R. A. Schumacher, B. Moreno, Gerard Gilfoyle, G. Ricco, C. Djalali, H. Hakobyan, H. S. Jo, Gerald Feldman, K. Hicks, O. Pogorelko, A. Deur, D. G. Jenkins, Federico Ronchetti, L. C. Dennis, L. Graham, P. Collins, B. E. Bonner, J. J. Melone, C. Salgado, D. Sokhan, K. Park, Daniel S. Carman, M. J. Amaryan, K. S. Egiyan, C. I O Gordon, N. Kalantarians, H. Avakian, W. K. Brooks, M. MacCormick, I. Hleiqawi, C. E. Hyde-Wright, D. Sharov, P. Ambrozewicz, K. Mikhailov, S. Bültmann, L. Morand, T. A. Forest, Cynthia Marie Hadjidakis, S. L. Careccia, Sergey Kuleshov, S. Stepanyan, K. L. Giovanetti, J. Pierce, Avraham Klein, Larry Weinstein, M. Bektasoglu, M. Nozar, Michael Dugger, H. O. Funsten, W. J. Briscoe, E. Pasyuk, S. A. Dytman, J. Salamanca, J. W C McNabb, L. Casey, B. B. Niczyporuk, N. Pivnyuk, V. Batourine, M. Battaglieri, L. C. Smith, E. Munevar, B. S. Ishkhanov, B. L. Berman, R. Bradford, B. A. Mecking, K. Lukashin, L. M. Qin, R. S. Hakobyan, K. A. Griffioen, C. Paterson, M. Klusman, D. P. Watts, M. R. Niroula, E. Golovatch, M. Bellis, S. Strauch, H. Egiyan, A. Cazes, Maryam Moteabbed, P. Coltharp, K. V. Dharmawardane, M. Y. Gabrielyan, R. J. Feuerbach, M. M. Ito, and Inna Aznauryan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Resonance, 01 natural sciences, Excited state, Isospin, 0103 physical sciences, Production (computer science), Invariant mass, Sensitivity (control systems), Atomic physics, 010306 general physics, Nucleon
Abstract: The exclusive electroproduction process $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}{e}^{'}n{\ensuremath{\pi}}^{+}$ was measured in the range of the photon virtuality ${Q}^{2}=1.7\text{\ensuremath{-}}4.5 {\mathrm{GeV}}^{2}$, and the invariant mass range for the $n{\ensuremath{\pi}}^{+}$ system of $W=1.15\text{\ensuremath{-}}1.7 \mathrm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive ${\ensuremath{\pi}}^{+}$ production from protons with nearly full coverage in the azimuthal and polar angles of the $n{\ensuremath{\pi}}^{+}$ center-of-mass system. The $n{\ensuremath{\pi}}^{+}$ channel has particular sensitivity to the isospin \textonehalf{} excited nucleon states, and together with the $p{\ensuremath{\pi}}^{0}$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the ${\ensuremath{\sigma}}_{{\mathit{LT}}^{'}}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.
Published: 2008

12. A double-target system for precision measurements of nuclear medium effects

Author: D. Kashy, H. Hakobyan, D. Tilles, G. Jacobs, T. Carstens, K. Bruhwel, D. Insley, P. Hemler, Y. G. Sharabian, X. Zheng, J. Gram, H. Egiyan, Larry Weinstein, B. A. Mecking, N. Gevorgyan, Volker D. Burkert, S. Christo, S. Stepanyan, William Brooks, and K. Hafidi
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Hydrogen, Scattering, business.industry, Attenuation, chemistry.chemical_element, Electron, Optics, chemistry, Deuterium, Vacuum chamber, Nuclear Experiment, business, Instrumentation, Beam (structure)
Abstract: A double-target system has been developed for precision measurements of nuclear medium effects in unpolarized electron scattering with 4–5 GeV electron beams. This system allows for a precise comparison of elementary targets such as deuterium and hydrogen to heavy solid targets to study subtle medium effects such as color transparency, transverse momentum broadening, and hadron attenuation. One cryo-target and one solid target were located in the beam simultaneously, separated by 4 cm to minimize acceptance correction differences in the large CLAS spectrometer while maintaining the ability to identify the target event-by-event. Because both targets were positioned in the beam simultaneously, time-dependent systematic effects such as drifting gains or inefficient detector channels cancel in ratios of observables, increasing the precision of the final results. Measurements were performed with hydrogen and deuterium in combination with 3 mm diameter targets of carbon, aluminum, iron, tin, and lead. The solid targets and deuterium target were comparable in thicknesses except for specialized diagnostic runs with ultra-thin aluminum. Switching of the solid targets was performed remotely and required only a few seconds to complete. An ultra-low mass vacuum chamber made from Rohacell ® foam provided vacuum isolation of the cryotarget without adding significantly to multiple scattering of final-state particles.
Published: 2008

13. Search for Medium Modifications of theρMeson

Author: S. A. Morrow, C. Djalali, C. Hanretty, A.V. Stavinsky, P. Ambrozewicz, D. J. Tedeschi, Baile Zhang, M. J. Amaryan, H. Juengst, R. A. Miskimen, B. McKinnon, M. MacCormick, Shifeng Chen, I. Bedlinskiy, Carlos A. Salgado, I. Hleiqawi, Andreas Klein, Ji Li, S. L. Careccia, D. Branford, L. Casey, B. B. Niczyporuk, N. Pivnyuk, Nikolay Shvedunov, M. Mirazita, J. M. Laget, K. L. Giovanetti, P. Collins, E. L. Isupov, N. Markov, J. Salamanca, Mark Richard James Williams, J. W C McNabb, Larry Weinstein, J. T. Goetz, S. Boiarinov, K. A. Griffioen, B. M. Preedom, S. McAleer, C. E. Hyde-Wright, J. P. Cummings, S. Niccolai, L. Elouadrhiri, S. Mehrabyan, H. Denizli, F. X. Girod, L. Blaszczyk, R. J. Feuerbach, Lorenzo Zana, J. Hardie, E. De Sanctis, Jens H. Kuhn, I. I. Strakovsky, A. I. Ostrovidov, K. Park, R. A. Schumacher, N. A. Baltzell, M. Khandaker, Dinko Pocanic, D. G. Ireland, V. Crede, Sergey Kuleshov, J. P. Santoro, M. Bektasoglu, H. Hakobyan, Federico Ronchetti, H. S. Jo, G. Riccardi, P. Muehlich, A. Deur, M. Kossov, Gerald Feldman, Volker D. Burkert, A. S. Biselli, S. E. Kuhn, J. R. Calarco, M. Guidal, Z. Krahn, L. C. Smith, E. Munevar, G. Ricco, D. I. Sober, S. Strauch, Rakhsha Nasseripour, K. Moriya, L. Todor, D. Doughty, C. Butuceanu, D. Protopopescu, N. Dashyan, G. Niculescu, M. Holtrop, N. Baillie, Mestayer, M. Battaglieri, B. S. Ishkhanov, S. Pozdniakov, M. Garçon, P. Eugenio, D. P. Watts, H. Egiyan, M. Taiuti, J. D. Kellie, R. C. Minehart, C. A. Meyer, B. Carnahan, S. Tkachenko, C. I O Gordon, F. Sabatié, V. Sapunenko, Laird Kramer, R. Bradford, B. A. Mecking, A. V. Vlassov, J. Langheinrich, G. V. Fedotov, N. Kalantarians, N. Benmouna, M. Ripani, M. Nozar, Yordanka Ilieva, Michael Vineyard, R. De Vita, Gerard Gilfoyle, M. Anghinolfi, Ulrich Mosel, J. J. Melone, Brian Raue, K. Livingston, James Mueller, D. P. Weygand, D. Sokhan, Cynthia Marie Hadjidakis, E. S. Smith, Maryam Moteabbed, M. R. Niroula, Alexei V. Klimenko, S. Anefalos Pereira, D. G. Jenkins, G. S. Mutchler, Michael Dugger, H. O. Funsten, Y. G. Sharabian, K. V. Dharmawardane, E. Wolin, B. L. Berman, S. Stepanyan, L. C. Dennis, R. Dickson, Sylvain Bouchigny, Barry Ritchie, J. P. Ball, Y. Prok, D. S. Carman, P. Rossi, C. Paterson, D. G. Crabb, J. Pierce, H. Avakian, P. Mattione, D. Sharov, N. Guler, G. E. Dodge, H. Y. Lu, P. V. Degtyarenko, S. Barrow, I. Niculescu, D. Lawrence, R. De Masi, P. Coltharp, William Brooks, Hall Crannell, M. M. Ito, S. Bültmann, W. J. Briscoe, E. Pasyuk, J. R. Johnstone, L. Guo, M. Ungaro, S. A. Dytman, M. Bellis, K. Joo, S. S. Stepanyan, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, J. W. Price, V. P. Kubarovsky, G. Rosner, O. Pogorelko, Frank Klein, Michael Wood, K. Hafidi, K. S. Egiyan, V. S. Serov, B. E. Stokes, G. S. Adams, K. Mikhailov, Clarisse Tur, P. Nadel-Turonski, Tsutomu Mibe, G. Gavalian, V. Mokeev, P. Stoler, W. Kim, J. Lachniet, K. Hicks, A. Tkabladze, R. S. Hakobyan, L. El Fassi, M. Osipenko, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. L. Cole, Z. W. Zhao, B. Zhao, F. W. Hersman, and R. W. Gothe
Subjects: Physics, Particle physics, Rho meson, Meson, Spectrometer, Nuclear Theory, Spectrum (functional analysis), General Physics and Astronomy, Order (ring theory), Physics and Astronomy(all), Resonance (particle physics), medicine.anatomical_structure, Deuterium, medicine, High Energy Physics::Experiment, Nuclear Experiment, Nucleus
Abstract: The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory. The vector mesons, $$\rho$$, $$\omega$$, and $$\phi$$, are observed via their decay to $e^+e^-$, in order to reduce the effects of final state interactions in the nucleus. Of particular interest are possible in-medium effects on the properties of the $$\rho$$ meson. The $$\rho$$ spectral function is extracted from the data on various nuclei, carbon, iron, and titanium, and compared to the spectrum from liquid deuterium, which is relatively free of nuclear effects. We observe no significant mass shift for the $$\rho$$ meson; however, there is some widening of the resonance in titanium and iron, which is consistent with expected collisional broadening.
Published: 2007

14. Twenty years of physics at MAMI —What did it mean?

Author: B. A. Mecking
Published: 2007

15. Erratum: Cross sections for theγp→K*0Σ+reaction atEγ=1.7−3.0GeV [Phys. Rev. C75, 042201 (2007)]

Author: Shifeng Chen, L. C. Dennis, M. Osipenko, H. Avakian, K. Livingston, K. Beard, K. A. Griffioen, J. Donnelly, G. Asryan, M. Battaglieri, R. Bradford, B. A. Mecking, O. P. Dzyubak, R. A. Niyazov, H. Egiyan, J. T. Goetz, R. Dickson, D. Doughty, G. Rosner, Carlos A. Salgado, J. W C McNabb, D. Heddle, A.V. Stavinsky, A. V. Vlassov, Maryam Moteabbed, W. J. Briscoe, E. Pasyuk, K. S. Egiyan, E. S. Smith, D. G. Jenkins, W. Kim, Laird Kramer, D. J. Tedeschi, Kwangsoo Kim, J. Lachniet, A. Tkabladze, S. A. Dytman, S. E. Kuhn, B. B. Niczyporuk, G. Riccardi, K. Mikhailov, B. L. Berman, M. Amarian, N. Guler, R. De Vita, I. Bedlinskiy, Andreas Klein, J. Langheinrich, B. E. Stokes, V. Sapunenko, C. Butuceanu, Sylvain Bouchigny, N. Pivnyuk, E. Wolin, Stephen Taylor, K. Lukashin, Ji Li, U. Thoma, C. Paterson, M. Bellis, P. Rossi, Gerard Gilfoyle, S. McAleer, F. X. Girod, S. A. Morrow, G. Gavalian, P. Stoler, R. S. Hakobyan, V. Batourine, S. Niccolai, C. Djalali, J. P. Ball, D. G. Ireland, M. D. Mestayer, V. Crede, G. Ricco, Y. Prok, V. Mokeev, D. S. Carman, J. Hardie, M. MacCormick, B. Carnahan, F. Sabatié, K. Hicks, J. R. Calarco, P. Ambrozewicz, Michael L. Williams, I. Hleiqawi, S. L. Careccia, V. P. Kubarovsky, S. Strauch, Atilla Gonenc, H. Juengst, D. G. Crabb, J. P. Cummings, G. S. Mutchler, M. Guidal, Z. Krahn, L. C. Smith, E. Munevar, N. A. Baltzell, E. De Sanctis, O. Pogorelko, K. L. Giovanetti, G. Niculescu, R. W. Gothe, N. Baillie, R. A. Miskimen, B. McKinnon, M. Anghinolfi, Larry Weinstein, B. S. Ishkhanov, S. Boiarinov, D. I. Sober, D. Branford, L. Elouadrhiri, M. R. Niroula, Yordanka Ilieva, M. Mirazita, J. M. Laget, M. Kossov, Frank Klein, I. I. Strakovsky, J. D. Kellie, A. Deur, R. G. Fersch, Rakhsha Nasseripour, M. Holtrop, Michael Dugger, B. Zhao, M. Khandaker, Brian Raue, P. Coltharp, Y. G. Sharabian, M. M. Ito, A. I. Ostrovidov, Michael Wood, K. Park, Michael Vineyard, Hong Lu, P. L. Cole, Z. W. Zhao, F. W. Hersman, S. Whisnant, B. M. Preedom, V. S. Serov, Federico Ronchetti, Lorenzo Zana, Volker D. Burkert, A. S. Biselli, Clarisse Tur, P. Nadel-Turonski, H. S. Jo, Tsutomu Mibe, Gerald Feldman, C. E. Hyde-Wright, R. C. Minehart, K. Wang, C. A. Meyer, K. Moriya, R. J. Feuerbach, Jens H. Kuhn, Sergey Kuleshov, S. Tkachenko, N. Benmouna, V. Gyurjyan, M. Ripani, G. V. Fedotov, N. Kalantarians, L. Todor, J. Zhang, H. Bagdasaryan, D. Protopopescu, J. W. Price, L. Guo, S. Pozdniakov, M. Garçon, M. Ungaro, K. Joo, S. S. Stepanyan, A. Yegneswaran, D. P. Weygand, Alexei V. Klimenko, Barry Ritchie, G. E. Dodge, P. V. Degtyarenko, I. Niculescu, D. Lawrence, R. De Masi, R. A. Schumacher, M. Nozar, S. Bültmann, S. Stepanyan, J. Pierce, William Brooks, Hall Crannell, P. Eugenio, M. Taiuti, P. Collins, J. P. Santoro, and Roy Thompson
Subjects: Baryon, Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Hadron, Elementary particle, Fermion, Boson, Sigma baryon
Published: 2007

16. Experimental study of exclusive 2H(e,e'p)n reaction mechanisms at high Q2

Author: K S, Egiyan, G, Asryan, N, Gevorgyan, K A, Griffioen, J M, Laget, S E, Kuhn, G, Adams, M J, Amaryan, P, Ambrozewicz, M, Anghinolfi, G, Audit, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, N A, Baltzell, S, Barrow, V, Batourine, M, Battaglieri, I, Bedlinskiy, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, L, Blaszczyk, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, A, Cazes, S, Chen, P L, Cole, P, Collins, P, Coltharp, D, Cords, P, Corvisiero, D, Crabb, V, Crede, J P, Cummings, N, Dashyan, R, De Masi, R, De Vita, E, De Sanctis, P V, Degtyarenko, H, Denizli, L, Dennis, A, Deur, K V, Dharmawardane, R, Dickson, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, S, Dytman, O P, Dzyubak, H, Egiyan, L, El Fassi, L, Elouadrhiri, P, Eugenio, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, R, Fersch, M, Garçon, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J T, Goetz, A, Gonenc, C I O, Gordon, R W, Gothe, M, Guidal, M, Guillo, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, K, Hafidi, H, Hakobyan, R S, Hakobyan, C, Hanretty, J, Hardie, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, N, Kalantarians, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, Z, Krahn, L H, Kramer, V, Kubarovsky, J, Kuhn, S V, Kuleshov, J, Lachniet, J, Langheinrich, D, Lawrence, Ji, Li, K, Livingston, H Y, Lu, M, Maccormick, C, Marchand, N, Markov, P, Mattione, S, McAleer, B, McKinnon, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, M D, Mestayer, C A, Meyer, T, Mibe, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, K, Moriya, S A, Morrow, M, Moteabbed, J, Mueller, E, Munevar, G S, Mutchler, P, Nadel-Turonski, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, G V, O'Rielly, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, S, Anefalos Pereira, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, F, Sabatié, J, Salamanca, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, N V, Shvedunov, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, D, Sokhan, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, P, Stoler, S, Strauch, M, Taiuti, D J, Tedeschi, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, D P, Watts, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, B, Zhao, and Z W, Zhao
Abstract: The reaction 2H(e,e'p)n has been studied with full kinematic coverage for photon virtuality 1.75Q25.5 GeV2. Comparisons of experimental data with theory indicate that for very low values of neutron recoil momentum (p(n)100 MeV/c) the neutron is primarily a spectator and the reaction can be described by the plane-wave impulse approximation. For 100p(n)750 MeV/c, proton-neutron rescattering dominates the cross section, while Delta production followed by the NDelta--NN transition is the primary contribution at higher momenta.
Published: 2007

17. Energy Calibration of the JLab Bremsstrahlung Tagging System

Author: M. Gabrielyan, I. Nakagawa, S. Boyarinov, A. V. Glamazdin, M. Wood, H. Egiyan, D. S. Dale, L. Gan, L. Guo, A. Teymurazyan, Ashot Gasparian, S. Stepanyan, and B. A. Mecking
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Photon, Physics - Instrumentation and Detectors, Spectrometer, 010308 nuclear & particles physics, Bremsstrahlung, FOS: Physical sciences, Particle accelerator, Instrumentation and Detectors (physics.ins-det), Photon energy, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Calibration, Atomic physics, 010306 general physics, Nuclear Experiment, Instrumentation, Energy (signal processing)
Abstract: In this report, we present the energy calibration of the Hall B bremsstrahlung tagging system at the Thomas Jefferson National Accelerator Facility. The calibration was performed using a magnetic pair spectrometer. The tagged photon energy spectrum was measured in coincidence with $e^+e^-$ pairs as a function of the pair spectrometer magnetic field. Taking advantage of the internal linearity of the pair spectrometer, the energy of the tagging system was calibrated at the level of $\pm 0.1% E_\gamma$. The absolute energy scale was determined using the $e^+e^-$ rate measurements close to the end-point of the photon spectrum. The energy variations across the full tagging range were found to be $, Comment: 15 pages, 12 figures
Published: 2006

18. Search for Theta++ pentaquarks in the exclusive reaction gammap--K+K-p

Author: V, Kubarovsky, M, Battaglieri, R, De Vita, J, Goett, L, Guo, G S, Mutchler, P, Stoler, D P, Weygand, P, Ambrozewicz, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, N A, Baltzell, V, Batourine, I, Bedlinskiy, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, S, Chen, E, Clinton, P L, Cole, P, Collins, P, Coltharp, D, Crabb, H, Crannell, V, Crede, J P, Cummings, R, De Masi, D, Dale, E, De Sanctis, P V, Degtyarenko, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, G, Fedotov, H, Funsten, M Y, Gabrielyan, L, Gan, M, Garçon, A, Gasparian, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, O, Glamazdin, J T, Goetz, E, Golovach, A, Gonenc, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, V, Gyurjyan, C, Hadjidakis, K, Hafidi, R S, Hakobyan, J, Hardie, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, H, Lu, M, MacCormick, N, Markov, B, McKinnon, B A, Mecking, J J, Melone, M D, Mestayer, C A, Meyer, T, Mibe, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mochalov, V, Mokeev, L, Morand, S A, Morrow, M, Moteabbed, P, Nadel-Turonski, I, Nakagawa, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, N V, Shvedunov, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, I I, Strakovsky, S, Strauch, M, Taiuti, D J, Tedeschi, A, Teymurazyan, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, L B, Weinstein, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, and B, Zhao
Abstract: The reaction gammap --pK+K- was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a Theta++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Theta++ was found. Upper limits on the total and differential cross section for the reaction gammap --K-Theta++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass M(Theta++) = 1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Theta++ width Gamma(Theta++)0.1 MeV/c2.
Published: 2006

19. Erratum:η′Photoproduction on the Proton for Photon Energies from 1.527 to 2.227 GeV [Phys. Rev. Lett.96, 062001 (2006)]

Author: Laird Kramer, Dinko Pocanic, G. S. Mutchler, S. E. Kuhn, G. Rosner, Stephen Taylor, Yordanka Ilieva, M. D. Mestayer, J. J. Manak, P. Eugenio, M. Osipenko, Shifeng Chen, M. Taiuti, S. Boiarinov, B. M. Preedom, M. Guidal, G. Niculescu, K. Beard, K. Livingston, K. S. Egiyan, M. Holtrop, R. A. Schumacher, Lorenzo Zana, Frank Klein, K. Mikhailov, M. Guillo, J. T. Goetz, J. Langheinrich, S. A. Philips, K. A. Griffioen, V. Batourine, D. G. Ireland, V. Crede, S. A. Morrow, P. Rubin, L. Elouadrhiri, A.V. Stavinsky, H. S. Jo, Gerald Feldman, J. R. Calarco, N. Guler, G. Gavalian, C. Djalali, G. Audit, C. E. Hyde-Wright, R. J. Feuerbach, M. Bektasoglu, J. Shaw, N. A. Baltzell, I. I. Strakovsky, B. Carnahan, F. Sabatié, K. Wang, B. E. Stokes, G. S. Adams, D. J. Tedeschi, V. Mokeev, J. P. Cummings, J. Hu, E. Wolin, P. Ambrozewicz, Michael Wood, A. Deur, J. Donnelly, G. Asryan, S. Barrow, O. P. Dzyubak, R. A. Niyazov, H. Juengst, V. S. Serov, R. A. Miskimen, B. McKinnon, I. Bedlinskiy, M. Anghinolfi, G. V. O'Rielly, J. P. Ball, Y. Prok, M. Kossov, Andreas Klein, K. V. Dharmawardane, M. Nozar, P. Corvisiero, James Mueller, Rakhsha Nasseripour, K. S. Dhuga, D. Branford, J. P. Santoro, M. Bellis, E. S. Smith, Marco A. Huertas, D. S. Carman, A. Coleman, H. R. Weller, Roy Thompson, D. Protopopescu, T. A. Forest, D. G. Jenkins, J. D. Kellie, Y. G. Sharabian, Cynthia Marie Hadjidakis, E. De Sanctis, M. Mirazita, J. M. Laget, M. Battaglieri, P. Collins, M. Spraker, V. Gyurjyan, A. I. Ostrovidov, P. Stoler, A. C S Lima, K. Park, L. C. Smith, S. Pozdniakov, M. Garçon, B. S. Ishkhanov, P. L. Cole, Michael Vineyard, A. Shafi, Mark Richard James Williams, S. Stepanyan, Sylvain Bouchigny, R. Bradford, B. A. Mecking, P. Rossi, R. DeVita, J. Zhang, V. P. Kubarovsky, D. G. Crabb, Michael Dugger, Volker D. Burkert, H. Egiyan, J. Pierce, J. W C McNabb, K. Hicks, W. Kim, Clarisse Tur, P. Nadel-Turonski, H. Bagdasaryan, J. W. Price, V. Sapunenko, Valeria Muccifora, A. Empl, O. Pogorelko, A. S. Biselli, P. Dragovitsch, D. I. Sober, S. McAleer, F. X. Girod, Tsutomu Mibe, B. L. Berman, H. O. Funsten, S. Niccolai, L. M. Qin, Gerard Gilfoyle, B. B. Niczyporuk, William Brooks, U. Thoma, L. C. Dennis, B. E. Bonner, P. Coltharp, N. Pivnyuk, K. Lukashin, J. Napolitano, Hall Crannell, H. Avakian, M. M. Ito, J. Hardie, S. Strauch, Jens H. Kuhn, C. Paterson, Nicola Bianchi, L. C. Maximon, C. Marchand, M. Klusman, J. Lachniet, A. Tkabladze, L. Guo, M. Ungaro, G. E. Dodge, D. Rowntree, P. V. Degtyarenko, K. Kim, S. Bültmann, W. J. Briscoe, E. Pasyuk, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, N. Baillie, S. A. Dytman, R. S. Hakobyan, R. Fatemi, A. Yegneswaran, D. Lawrence, A. V. Vlassov, Kwangsoo Kim, G. Riccardi, C. Butuceanu, S. Tkachenko, N. Benmouna, T. Lee, M. Ripani, Carlos A. Salgado, G. Ricco, Brian Raue, Federico Ronchetti, R. C. Minehart, C. A. Meyer, G. V. Fedotov, D. P. Weygand, D. Doughty, H. Denizli, D. Heddle, A. V. Skabelin, Alexei V. Klimenko, Barry Ritchie, E. Anciant, M. Khandaker, I. Hleiqawi, S. L. Careccia, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, F. W. Hersman, and R. W. Gothe
Subjects: Physics, Nuclear physics, Meson production, Photon, Proton, General Physics and Astronomy
Published: 2006

20. Search for the Theta+ Pentaquark in the gammad--DeltanK+ reaction measured with the CLAS spectrometer

Author: S, Niccolai, M, Mirazita, P, Rossi, N A, Baltzell, D S, Carman, K, Hicks, B, McKinnon, T, Mibe, S, Stepanyan, D J, Tedeschi, G, Adams, P, Ambrozewicz, S, Anefalos Pereira, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, V, Batourine, M, Battaglieri, I, Bedlinskiy, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Boiarinov, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, B, Carnahan, S, Chen, P L, Cole, P, Collins, P, Coltharp, D, Crabb, H, Crannell, V, Crede, J P, Cummings, N, Dashyan, P V, Degtyarenko, R, De Masi, A, Deppman, E, De Sanctis, A, Deur, R, Devita, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, El Fassi, L, Elouadrhiri, P, Eugenio, G, Fedotov, G, Feldman, H, Funsten, M, Garçon, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J T, Goetz, A, Gonenc, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, K, Hafidi, H, Hakobyan, R S, Hakobyan, J, Hardie, F W, Hersman, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, V, Kubarovsky, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, H, Lu, M, MacCormick, N, Markov, B A, Mecking, J, Mellor, J J, Melone, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, M, Moteabbed, G S, Mutchler, P, Nadel-Turonski, J, Napolitano, R, Nasseripour, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, J, de Oliveira Echeimberg, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, N V, Shvedunov, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, B E, Stokes, P, Stoler, I I, Strakovsky, S, Strauch, M, Taiuti, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, D P, Watts, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, B, Zhao, and Z, Zhao
Abstract: For the first time, the reaction gammad--DeltanK+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the gammad--DeltaTheta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
Published: 2006

21. Search for the Theta+ pentaquark in the reaction gammad --pK-K+n

Author: B, McKinnon, K, Hicks, N A, Baltzell, D S, Carman, M D, Mestayer, T, Mibe, M, Mirazita, S, Niccolai, P, Rossi, S, Stepanyan, D J, Tedeschi, P, Ambrozewicz, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, V, Batourine, M, Battaglieri, I, Bedlinskiy, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, S, Chen, P L, Cole, P, Collins, P, Coltharp, D, Crabb, V, Crede, D, Dale, R, De Masi, R, DeVita, E, De Sanctis, P V, Degtyarenko, A, Deur, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, G, Fedotov, G, Feldman, H, Funsten, M, Gabrielyan, L, Gan, M, Garçon, A, Gasparian, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J T, Goetz, A, Gonenc, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, L, Guo, V, Gyurjyan, R S, Hakobyan, F W, Hersman, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, M, Kossov, L H, Kramer, V, Kubarovsky, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J, Langheinrich, D, Lawrence, K, Livingston, H, Lu, M, MacCormick, B A, Mecking, C A, Meyer, K, Mikhailov, R, Miskimen, V, Mokeev, S A, Morrow, M, Moteabbed, G S, Mutchler, I, Nakagawa, P, Nadel-Turonski, R, Nasseripour, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, O, Pogorelko, S, Pozdniakov, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, B E, Stokes, P, Stoler, I I, Strakovsky, S, Strauch, M, Taiuti, A, Teymurazyan, U, Thoma, A, Tkabladze, S, Tkachenko, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, B, Zhao, and Z, Zhao
Abstract: A search for the Theta+ in the reaction gammad --pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta+ production in the mass range of 1.52-1.56 GeV/c2 for the gammad --pK-Theta+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta+ production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamman --K-Theta+ reaction is estimated to be a factor of 10 higher, i.e., approximately 3 nb (95% C.L.).
Published: 2006

22. Differential cross sections forγ+p→K++Yfor Λ andΣ0hyperons

Author: R. Bradford, R. A. Schumacher, J. W. C. McNabb, L. Todor, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, N. Bianchi, A. S. Biselli, B. E. Bonner, S. Bouchigny, S. Boiarinov, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, S. Chen, P. L. Cole, A. Coleman, P. Coltharp, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, R. DeVita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. J. Feuerbach, T. A. Forest, H. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, E. Golovatch, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, J. Hu, M. Huertas, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, H. G. Juengst, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, A. C. S. Lima, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, B. McKinnon, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, P. Nadel-Turonski, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O'Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. P. Quinn, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, R. Suleiman, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, S. Tkachenko, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, L. Zana, J. Zhang, and B. Zhao
Subjects: Physics, Nuclear and High Energy Physics, Angular distribution, Effective lagrangian, Hyperon, Theoretical models, Sigma, Atomic physics, Lambda, Scaling, Resonance (particle physics)
Abstract: High-statistics cross sections for the reactions {gamma} + p {yields} K{sup +} + {Lambda} and {gamma} + p {yields} K{sup +} + {Sigma}{sup 0} have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85 < cos {theta}{sub K{sup +}}{sup c.m.} < +0.95. In the K{sup +}{Lambda} channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. The position and width of this structure change with angle, indicating that more than one resonance is likely playing a role. The K{sup +} {Lambda} channel at forward angles and all energies is well described by a t-channel scaling characteristic of Regge exchange, while the same scaling applied to the K{sup +} {Sigma}{sup 0} channel is less successful. Several existing theoretical models are compared to the data, but none provide a good representation of the results.
Published: 2006

23. Search forΘ+(1540)Pentaquark in High-Statistics Measurement ofγp→K¯0K+nat CLAS

Author: S. A. Morrow, C. Djalali, G. E. Dodge, P. V. Degtyarenko, P. Ambrozewicz, K. A. Griffioen, I. Niculescu, D. Lawrence, R. W. Gothe, R. A. Schumacher, J. Donnelly, G. Asryan, Ashot Gasparian, C. I O Gordon, Hall Crannell, S. Bültmann, P. Eugenio, L. Morand, O. P. Dzyubak, U. Thoma, A. V. Vlassov, S. Stepanyan, M. Bellis, J. Pierce, Avraham Klein, B. E. Stokes, P. Nadel-Turonski, T. Lee, Tsutomu Mibe, S. Niccolai, V. Gyurjyan, Federico Ronchetti, H. Avakian, M. Taiuti, J. Hardie, Y. Ilieva, V. Batourine, G. Ricco, J. Zhang, M. Y. Gabrielyan, G. S. Mutchler, J. P. Cummings, H. G. Juengst, M. Osipenko, L. C. Smith, H. Bagdasaryan, F. X. Girod, Gerard Gilfoyle, R. De Vita, A.V. Stavinsky, K. S. Egiyan, B. S. Ishkhanov, J. Langheinrich, J. Lachniet, A. Tkabladze, K. Mikhailov, A. Teymurazyan, I. Hleiqawi, Sylvain Bouchigny, D. J. Tedeschi, E. De Sanctis, J. J. Melone, B. Zhao, Friedrich Klein, Brian Raue, M. Kossov, N. A. Baltzell, F. Sabatié, I. Bedlinskiy, B. B. Niczyporuk, J. Goett, R. A. Miskimen, B. McKinnon, P. Rossi, D. I. Sober, V. V. Mochalov, N. Pivnyuk, Lorenzo Zana, S. L. Careccia, R. S. Hakobyan, Daniel S. Carman, K. V. Dharmawardane, D. G. Ireland, C. E. Hyde-Wright, J. R. Calarco, Sergey Kuleshov, M. Nozar, W. J. Briscoe, E. Pasyuk, P. Stoler, I. Nakagawa, L. Guo, M. Ungaro, M. Battaglieri, K. Joo, R. A. Niyazov, R. Bradford, B. A. Mecking, S. S. Stepanyan, A. Yegneswaran, D. Protopopescu, D. Branford, S. Pozdniakov, M. Garçon, M. Mirazita, J. M. Laget, K. Livingston, D. S. Dale, F. W. Hersman, G. Rosner, R. Nasseripour, J. Kuhn, J. P. Santoro, H. S. Jo, C. Salgado, J. D. Kellie, P. Coltharp, M. M. Ito, Atilla Gonenc, J. W. Price, K. L. Giovanetti, Larry Weinstein, Laird Kramer, M. Khandaker, K. Hicks, N. Guler, S. Strauch, K. Park, E. N. Golovach, M. Guidal, H. Egiyan, N. Baillie, E. Clinton, D. G. Jenkins, B. L. Berman, V. Mokeev, M. Holtrop, V. P. Kubarovsky, O. Pogorelko, P. L. Cole, C. Paterson, D. Doughty, Michael Wood, W. Kim, V. S. Serov, G. Niculescu, Cynthia Marie Hadjidakis, L. Todor, Michael Dugger, H. O. Funsten, I. I. Strakovsky, Ji Li, A. I. Ostrovidov, M. D. Mestayer, V. Sapunenko, Dinko Pocanic, Michael L. Williams, A. Deur, S. Boiarinov, Volker D. Burkert, S. E. Kuhn, A. S. Biselli, W. K. Brooks, C. Tur, Latifa Elouadrhiri, Shifeng Chen, R. C. Minehart, C. A. Meyer, G. V. Fedotov, D. P. Weygand, O. Glamazdin, Alexei V. Klimenko, Barry Ritchie, J. T. Goetz, Elton Smith, L. Gan, M. F. Vineyard, M. Anghinolfi, G. Gavalian, S. Tkachenko, N. Benmouna, M. Ripani, Y. G. Sharabian, G. Riccardi, C. Butuceanu, E. Wolin, J. P. Ball, Y. Prok, and D. G. Crabb
Subjects: Physics, Particle physics, Luminosity (scattering theory), Hyperon, General Physics and Astronomy, Strangeness, Photon energy, Pentaquark, Baryon, Nuclear physics, Particle decay, Exotic baryon, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The exclusive reaction gammap-->K0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Theta+ (1540)-->nK+. The decay to nK+requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Theta+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
Published: 2006

24. MEASUREMENT OF THE N ---> DELTA+(1232) TRANSITION AT HIGH MOMENTUM TRANSFER BY PI0 ELECTROPRODUCTION

Author: M, Ungaro, P, Stoler, I, Aznauryan, V D, Burkert, K, Joo, L C, Smith, G, Adams, M, Amarian, P, Ambrozewicz, M, Anghinolfi, G, Asryan, G, Audit, H, Avakian, H, Bagdasaryan, J P, Ball, N A, Baltzell, S, Barrow, V, Batourine, M, Battaglieri, I, Bedliski, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, B E, Bonner, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, A, Cazes, S, Chen, P L, Cole, P, Coltharp, D, Cords, P, Corvisiero, D, Crabb, J P, Cummings, E De, Sanctis, R, Devita, P V, Degtyarenko, H, Denizli, L, Dennis, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, S, Dytman, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, H, Funsten, M, Garçon, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J, Goetz, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, M, Guillo, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, F W, Hersman, I, Hleiqawi, M, Holtrop, K, Hicks, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, M M, Ito, D, Jenkins, H S, Jo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, V, Kubarovsky, J, Kuhn, S E, Kuhn, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, C, Marchand, N, Markov, S, McAleer, B, McKinnon, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, J, Mueller, G S, Mutchler, J, Napolitano, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M, Niroula, R A, Niyazov, M, Nozar, G V, O'rielly, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, P D, Rubin, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, A V, Skabelin, E S, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, I I, Strakovsky, S, Strauch, M, Taiuti, D J, Tedeschi, U, Thoma, A, Tkabladze, L, Todor, S, Tkachenko, C, Tur, M F, Vineyard, A V, Vlassov, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, B, Zhang, J, Zhang, and B, Zhao
Abstract: We report a new measurement of the exclusive electroproduction reaction gamma(*)p--pi(0)p to explore the evolution from soft nonperturbative physics to hard processes via the Q(2) dependence of the magnetic (M(1+)), electric (E(1+)), and scalar (S(1+)) multipoles in the N--Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c(2), 4pi center-of-mass solid angle, and Q(2) from 3 to 6 GeV(2)/c(2), the highest yet achieved. It is found that the magnetic form factor G(M)(*) decreases with Q(2) more steeply than the proton magnetic form factor, the ratio E(1+)/M(1+) is small and negative, indicating strong helicity nonconservation, and the ratio S(1+)/M(1+) is negative, while its magnitude increases with Q(2).
Published: 2006

25. Coincidence experiments at the Bonn 500 MeV synchrotron

Author: B. A. Mecking
Subjects: Physics, Light nucleus, Field (physics), Nuclear Theory, Synchrotron, Coincidence, law.invention, Nuclear physics, Pion, Photodisintegration, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The activities in the field of mediiun energy photonuclear physics at the Bonn 500 MeV synchrotron are described. The experiments focus on the photodisintegration of light nuclei and on pion photoproduction in the Δ-resonance region.
Published: 2005

26. Search for Theta+ (1540) Pentaquark in High-Statistics Measurement of gammap--K0K+n at CLAS

Author: M, Battaglieri, R, De Vita, V, Kubarovsky, L, Guo, G S, Mutchler, P, Stoler, D P, Weygand, P, Ambrozewicz, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, N A, Baltzell, V, Batourine, I, Bedlinskiy, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, S, Chen, E, Clinton, P L, Cole, P, Coltharp, D, Crabb, H, Crannell, J P, Cummings, D, Dale, E, De Sanctis, P V, Degtyarenko, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, G, Fedotov, H, Funsten, M Y, Gabrielyan, L, Gan, M, Garçon, A, Gasparian, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, O, Glamazdin, J, Goett, J T, Goetz, E, Golovach, A, Gonenc, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, B, McKinnon, B A, Mecking, J J, Melone, M D, Mestayer, C A, Meyer, T, Mibe, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mochalov, V, Mokeev, L, Morand, S A, Morrow, P, Nadel-Turonski, I, Nakagawa, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, I I, Strakovsky, S, Strauch, M, Taiuti, D J, Tedeschi, A, Teymurazyan, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, L B, Weinstein, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, and B, Zhao
Abstract: The exclusive reaction gammap--K0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Theta+ (1540)--nK+. The decay to nK+requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Theta+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
Published: 2005

27. Erratum: Radiative decays of theΣ0(1385)andΛ(1520)hyperons [Phys. Rev. C71, 054609 (2005)]

Author: A. V. Vlassov, T. Lee, M. Spraker, Michael Vineyard, G. V. O'Rielly, B. E. Stokes, G. S. Adams, D. G. Jenkins, B. S. Raue, J. P. Santoro, R. DeVita, J. W C McNabb, L. Todor, Roy Thompson, Kwangsoo Kim, G. Riccardi, C. Butuceanu, D. Protopopescu, S. Pozdniakov, M. Garçon, E. Wolin, J. P. Ball, Y. Prok, D. S. Carman, D. G. Crabb, Yordanka Ilieva, Ji Li, W. Kim, J. P. Cummings, R. A. Schumacher, L. Elouadrhiri, M. Kossov, Rakhsha Nasseripour, K. S. Egiyan, I. I. Strakovsky, V. Koubarovski, C. I O Gordon, M. Bellis, K. Mikhailov, M. M. Ito, M. Nozar, A. Deur, E. De Sanctis, L. Morand, T. A. Forest, S. Stepanyan, Federico Ronchetti, D. I. Sober, A. Empl, O. Pogorelko, L. C. Dennis, B. E. Bonner, G. Ricco, G. S. Mutchler, H. Avakian, V. Batourine, C. A. Meyer, E. Golovatch, G. Asryan, S. Bültmann, B. Carnahan, O. P. Dzyubak, R. A. Niyazov, W. J. Briscoe, E. Pasyuk, F. Sabatié, J. D. Kellie, S. A. Dytman, M. D. Mestayer, J. J. Manak, P. Corvisiero, M. Anghinolfi, U. Thoma, H. R. Weller, G. E. Dodge, Frank Klein, James Mueller, P. V. Degtyarenko, K. Kim, K. V. Dharmawardane, L. C. Smith, J. Shaw, D. P. Weygand, Michael Wood, Y. G. Sharabian, S. A. Morrow, P. Stoler, I. Niculescu, A. Shafi, P. Rubin, C. Djalali, S. Boiarinov, D. Lawrence, M. Guillo, J. Langheinrich, K. Hicks, V. S. Serov, M. Osipenko, S. A. Philips, Shifeng Chen, William Brooks, G. Rosner, Hall Crannell, H. Denizli, V. Sapunenko, C. Marchand, Valeria Muccifora, B. L. Berman, M. Battaglieri, L. M. Qin, P. Ambrozewicz, F. W. Hersman, H. Juengst, A. I. Ostrovidov, A. C S Lima, K. Park, Gerard Gilfoyle, E. Polli, M. Klusman, R. W. Gothe, G. Audit, C. E. Hyde-Wright, A. V. Skabelin, R. J. Feuerbach, Dinko Pocanic, M. Bektasoglu, Alexei V. Klimenko, R. Bradford, B. A. Mecking, Volker D. Burkert, A. S. Biselli, S. E. Kuhn, Cynthia Marie Hadjidakis, B. M. Preedom, M. Guidal, Barry Ritchie, G. Niculescu, P. Eugenio, Stephen Taylor, S. McAleer, M. Taiuti, K. A. Griffioen, Michael Dugger, M. Holtrop, H. O. Funsten, B. B. Niczyporuk, S. Strauch, J. J. Melone, Laird Kramer, D. G. Ireland, N. Pivnyuk, Lorenzo Zana, J. R. Calarco, K. Lukashin, J. Napolitano, R. A. Miskimen, Carlos A. Salgado, D. Branford, J. Hu, Gerald Feldman, M. Mirazita, J. M. Laget, K. Wang, N. Benmouna, M. Ripani, E. S. Smith, Marco A. Huertas, Sylvain Bouchigny, P. Rossi, Mark Richard James Williams, P. Dragovitsch, S. Niccolai, J. Hardie, A.V. Stavinsky, D. J. Tedeschi, K. Beard, Andreas Klein, G. Gavalian, V. Mokeev, D. Doughty, D. Heddle, J. Lachniet, A. Tkabladze, H. Egiyan, E. Anciant, C. S. Whisnant, D. Rowntree, M. Khandaker, V. Gyurjyan, K. Livingston, R. S. Hakobyan, N. Guler, H. Bagdasaryan, J. W. Price, L. Guo, S. Barrow, M. Ungaro, I. Hleiqawi, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, A. Yegneswaran, R. G. Fersch, S. Simionatto, P. L. Cole, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, Clarisse Tur, Jens H. Kuhn, Nicola Bianchi, R. Suleiman, and R. Fatemi
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Hyperon, Radiative decay, Radiative transfer, Sigma, Lambda, Particle identification
Published: 2005

28. Measurement of the polarized structure functionσLT′forp(e⃗,e′π+)nin theΔ(1232)resonance region

Author: K. Joo, L. C. Smith, I. G. Aznauryan, V. D. Burkert, R. Minehart, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, M. Bektasoglu, N. Benmouna, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, S. Chen, L. Ciciani, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, R. DeVita, P. V. Degtyarenko, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fersch, R. J. Feuerbach, T. A. Forest, H. Funsten, S. J. Gaff, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, D. Ireland, M. M. Ito, D. Jenkins, H. G. Juengst, J. D. Kellie, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, V. Koubarovski, L. H. Kramer, S. E. Kuhn, J. Kuhn, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. O. Nelson, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, and L. Zana
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, 01 natural sciences, Delta baryon, Baryon, Pion, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The polarized longitudinal-transverse structure function {sigma}{sub LT{sup '}} has been measured using the p(e-vector,e{sup '}{pi}{sup +})n reaction in the {delta}(1232) resonance region at Q{sup 2}=0.40 and 0.65 GeV{sup 2}. No previous {sigma}{sub LT{sup '}} data exist for this reaction channel. The kinematically complete experiment was performed at the Jefferson Lab with the CEBAF large acceptance spectrometer using longitudinally polarized electrons at an energy of 1.515 GeV. A partial-wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured {pi}{sup 0}p channel. A fit to both {pi}{sup 0}p and {pi}{sup +}n channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the nonresonant background. The t-channel pion pole term is important in the {pi}{sup 0}p channel through a rescattering correction, which could be model dependent.
Published: 2004

29. Onset of asymptotic scaling in deuteron photodisintegration

Author: P. Rossi, M. Mirazita, F. Ronchetti, E. De Sanctis, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, S. Chen, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, R. De Vita, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deppman, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, M. Gai, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, C. I. O. Gordon, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, A. C. S. Lima, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O'Brien, G. V. O'Rielly, M. Osipenko, A. Ostrovidov, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, D. Rowntree, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, B. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, B. Zhang, and Z. Zhou
Subjects: Physics, Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Strong interaction, 2-BODY PHOTODISINTEGRATION, FOS: Physical sciences, General Physics and Astronomy, Photon energy, High Energy Physics - Experiment, Nuclear physics, Momentum, Baryon, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Photodisintegration, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Nucleon
Abstract: We investigate the transition from the nucleon-meson to quark-gluon description of the strong interaction using the photon energy dependence of the $d(\gamma,p)n$ differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between $30^{\circ}$ and $150^{\circ}$. A possible signature for this transition is the onset of cross section $s^{-11}$ scaling with the total energy squared, $s$, at some proton transverse momentum, $P_T$. The results show that the scaling has been reached for proton transverse momentum above about 1.1 GeV/c. This may indicate that the quark-gluon regime is reached above this momentum., Comment: Accepted by PRL; 5 pages, 2 figures
Published: 2004

30. Publisher’s Note: Two-Nucleon Momentum Distributions Measured inHe3(e,e′pp)n[Phys. Rev. Lett.PRLTAO0031-900792, 052303 (2004)]

Author: K. A. Griffioen, Shifeng Chen, G. Gavalian, S. McAleer, Y. Kuang, J. Langheinrich, Cynthia Marie Hadjidakis, S. A. Philips, E. Wolin, E. Polli, Michael Dugger, R. DeVita, H. O. Funsten, J. W C McNabb, S. Strauch, J. P. Ball, Y. Prok, P. L. Cole, D. S. Carman, Dinko Pocanic, V. Gyurjyan, H. Bagdasaryan, J. W. Price, Min Suk Kim, J. R. Calarco, R. A. Schumacher, Frank Klein, S. E. Kuhn, J. P. Cummings, J. Hu, C. A. Meyer, G. S. Mutchler, J. H. Kelley, Stephen Taylor, R. Fatemi, Carlos A. Salgado, C. I O Gordon, Patrick Girard, J. Shaw, Federico Ronchetti, G. Audit, C. E. Hyde-Wright, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, A. V. Vlassov, D. G. Crabb, L. Ciciani, M. Nozar, Michael Wood, G. V. O'Rielly, R. J. Feuerbach, J. Lachniet, L. Morand, D. Rowntree, M. Kossov, T. A. Forest, V. S. Serov, G. Ricco, S. Stepanyan, P. Ambrozewicz, H. Juengst, M. Osipenko, J. R. Ficenec, M. Bektasoglu, Rakhsha Nasseripour, N. Dashyan, D. G. Jenkins, M. Bellis, K. Sabourov, M. Anghinolfi, K. Park, Shalev Gilad, S. Simionatto, E. S. Smith, James Mueller, K. Beard, R. S. Hakobyan, E. De Sanctis, P. Eugenio, L. C. Smith, B. Carnahan, G. E. Dodge, F. Sabatié, D. P. Weygand, M. Guidal, Y. G. Sharabian, Sylvain Bouchigny, Yordanka Ilieva, D. I. Sober, P. Dragovitsch, Ji Li, Brian Raue, P. Rossi, G. Niculescu, Daijin Kim, P. V. Degtyarenko, K. Kim, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, W. Kim, M. Taiuti, N. Pivnyuk, K. L. Giovanetti, B. Asavapibhop, S. Niccolai, A. Empl, O. Pogorelko, M. Holtrop, M. D. Mestayer, J. J. Manak, Clarisse Tur, K. Lukashin, J. Napolitano, L. C. Dennis, I. Niculescu, D. Lawrence, Laird Kramer, Alexei V. Klimenko, Larry Weinstein, B. E. Bonner, Thierry Auger, J. Hardie, H. Avakian, G. Asryan, O. P. Dzyubak, R. A. Niyazov, N. Benmouna, M. Ripani, D. Doughty, K. V. Dharmawardane, S. Boiarinov, S. Mehrabyan, Barry Ritchie, D. Heddle, Kwangsoo Kim, G. Riccardi, William Brooks, Hall Crannell, C. Butuceanu, P. Corvisiero, M. Spraker, C. Cetina, Michael Vineyard, J. D. Kellie, K. S. Dhuga, C. Marchand, B. M. Preedom, J. J. Melone, William Bertozzi, E. Anciant, B. L. Berman, L. M. Qin, E. Pasyuk, M. Khandaker, K. Wang, J. P. Santoro, M. Klusman, S. A. Dytman, Roy Thompson, M. Battaglieri, P. Stoler, A. Coleman, S. O. Nelson, H. Denizli, H. R. Weller, K. Hicks, K. S. Egiyan, R. Bradford, B. A. Mecking, K. Mikhailov, A. V. Skabelin, M. M. Ito, H. Egiyan, S. McLauchlan, C. S. Whisnant, G. S. Adams, L. Todor, D. Protopopescu, S. Pozdniakov, A. Shafi, U. Thoma, Jens H. Kuhn, Nicola Bianchi, K. Livingston, W. Ingram, F. W. Hersman, G. A. Peterson, M. Guillo, S. Barrow, R. W. Gothe, L. Elouadrhiri, R. A. Miskimen, I. I. Strakovsky, L. Guo, M. Ungaro, K. Joo, D. Branford, J. Yun, D. Cords, A. Yegneswaran, M. Mirazita, J. M. Laget, V. Sapunenko, Valeria Muccifora, A.V. Stavinsky, D. J. Tedeschi, Gerard Gilfoyle, Andreas Klein, and Baile Zhang
Subjects: Physics, Momentum (technical analysis), General Physics and Astronomy, Few-body systems, Nucleon, Mathematical physics
Published: 2004

31. Publisher’s Note: Observation of an Exotic Baryon withS=+1in Photoproduction from the Proton [Phys. Rev. Lett.PRLTAO0031-900792, 032001 (2004)]

Author: K. Park, Clarisse Tur, Volker D. Burkert, A. K. Opper, Shifeng Chen, A. S. Biselli, M. Osipenko, U. Thoma, L. C. Smith, K. Beard, S. J. Gaff, R. W. Major, B. Carnahan, F. Sabatié, E. Polli, G. V. O'Rielly, B. M. Preedom, J. Lachniet, D. Rowntree, L. Elouadrhiri, V. Gyurjyan, J. P. Santoro, L. Ciciani, K. A. Griffioen, S. Simionatto, D. G. Jenkins, Roy Thompson, K. Sabourov, Thierry Auger, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, Dinko Pocanic, I. I. Strakovsky, G. Gavalian, V. Mokeev, R. S. Hakobyan, Brian Raue, S. E. Kuhn, K. Wang, R. C. Minehart, R. A. Miskimen, C. A. Meyer, J. Langheinrich, E. De Sanctis, V. V. Frolov, J. H. Kelley, Stephen Taylor, H. Bagdasaryan, S. A. Philips, G. S. Adams, F. W. Hersman, S. McAleer, G. A. Peterson, J. P. Cummings, O. P. Dzyubak, R. A. Niyazov, D. Branford, M. Mirazita, J. W. Price, L. Guo, M. Ungaro, S. Barrow, B. L. Berman, John T. O'Brien, W. Kim, M. Kossov, D. I. Sober, P. L. Cole, P. Dragovitsch, J. M. Laget, L. M. Qin, Laird Kramer, H. Egiyan, D. P. Weygand, P. Corvisiero, Alexei V. Klimenko, R. Fatemi, J. R. Ficenec, Rakhsha Nasseripour, L. Todor, D. Protopopescu, William Brooks, A. V. Vlassov, P. Eugenio, M. Taiuti, M. Anghinolfi, S. Strauch, S. Niccolai, Hall Crannell, S. Pozdniakov, M. Garçon, C. S. Whisnant, Federico Ronchetti, James Mueller, M. Spraker, C. Cetina, Frank Klein, G. S. Mutchler, Barry Ritchie, J. Hardie, Michael Vineyard, A. Longhi, J. R. Calarco, R. DeVita, J. W C McNabb, Y. G. Sharabian, R. W. Gothe, M. Guidal, M. Klusman, M. Guillo, N. Benmouna, A.V. Stavinsky, J. J. Melone, A. Weisberg, P. Stoler, J. Hu, K. Joo, C. Marchand, Ji Li, M. Ripani, G. Niculescu, Carlos A. Salgado, S. A. Morrow, P. Rubin, J. Yun, D. Cords, A. Shafi, M. D. Mestayer, P. Heimberg, C. Djalali, D. J. Tedeschi, A. Yegneswaran, Patrick Girard, J. J. Manak, J. Shaw, S. O. Nelson, K. Hicks, Michael Wood, S. Boiarinov, M. Holtrop, Thomas E. Smith, R. A. Schumacher, E. S. Smith, K. S. Egiyan, P. Ambrozewicz, V. S. Serov, K. Mikhailov, Cynthia Marie Hadjidakis, H. Denizli, Sylvain Bouchigny, H. Juengst, Michael Dugger, H. O. Funsten, C. I O Gordon, P. Rossi, L. Farhi, M. Nozar, M. Bellis, M. U. Mozer, L. Morand, T. A. Forest, S. Stepanyan, G. Audit, V. Sapunenko, G. E. Dodge, J. Connelly, A. V. Skabelin, K. V. Dharmawardane, R. J. Feuerbach, P. V. Degtyarenko, K. Kim, V. P. Kubarovsky, Valeria Muccifora, I. Niculescu, D. Lawrence, M. Bektasoglu, A. Empl, B. B. Niczyporuk, O. Pogorelko, D. Hancock, N. Pivnyuk, K. Lukashin, J. Napolitano, L. C. Dennis, Gerard Gilfoyle, Jens H. Kuhn, Nicola Bianchi, H. Avakian, M. M. Ito, W. J. Briscoe, M. Battaglieri, E. Pasyuk, S. A. Dytman, R. Bradford, B. A. Mecking, E. Anciant, M. Khandaker, D. Doughty, D. Heddle, Yordanka Ilieva, S. Mehrabyan, Kwangsoo Kim, G. Riccardi, C. Butuceanu, E. Wolin, J. P. Ball, Y. Prok, D. S. Carman, M. Sargsyan, and D. G. Crabb
Subjects: Nuclear physics, Physics, Particle physics, Proton, Exotic baryon, Hyperon, General Physics and Astronomy
Published: 2004

32. Two-Nucleon Momentum Distributions Measured in 3He(e,e'pp)n

Author: R A, Niyazov, L B, Weinstein, G, Adams, P, Ambrozewicz, E, Anciant, M, Anghinolfi, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, W, Bertozzi, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W K, Brooks, V D, Burkert, C, Butuceanu, J R, Calarco, D S, Carman, B, Carnahan, C, Cetina, S, Chen, L, Ciciani, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, N, Dashyan, R, DeVita, P V, Degtyarenko, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, O P, Dzyubak, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, P, Eugenio, R, Fatemi, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, C I O, Gordon, R W, Gothe, K, Griffioen, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, F W, Hersman, K, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, Y, Ilieva, W, Ingram, M M, Ito, D, Jenkins, K, Joo, H G, Juengst, J H, Kelley, J, Kellie, M, Khandaker, D H, Kim, K Y, Kim, K, Kim, M S, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, Ji, Li, K, Livingston, K, Lukashin, J J, Manak, C, Marchand, S, McAleer, S, McLauchlan, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, M D, Mestayer, C A, Meyer, K, Mikhailov, M, Mirazita, R, Miskimen, L, Morand, S A, Morrow, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M, Nozar, G V, O'Rielly, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Strauch, M, Taiuti, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, and B, Zhang
Subjects: SHORT-RANGE CORRELATIONS, KNOCKOUT, NUCLEI, HE-3, O-16, KNOCKOUT, NUCLEI, SHORT-RANGE CORRELATIONS, O-16, HE-3
Abstract: We have measured the 3He(e,e'pp)n reaction at 2.2 GeV over a wide kinematic range. The kinetic energy distribution for "fast" nucleons (p250 MeV/c) peaks where two nucleons each have 20% or less, and the third nucleon has most of the transferred energy. These fast pp and pn pairs are back to back with little momentum along the three-momentum transfer, indicating that they are spectators. Calculations by Sargsian and by Laget also indicate that we have measured distorted two-nucleon momentum distributions by striking one nucleon and detecting the spectator correlated pair.
Published: 2004

33. Proton Source Size Measurements in the eA->e'ppX Reaction

Author: A V, Stavinsky, K R, Mikhailov, R, Lednicky, A V, Vlassov, G, Adams, P, Ambrozewich, E, Anciant, M, Anghinolfi, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, V, Batourine, M, Battaglieri, K, Beard, M, Bektasoglu, M, Bellis, N, Benmouna, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W K, Brooks, V D, Burkert, C, Butuceanu, J R, Calarco, D S, Carman, C, Cetina, S, Chen, P L, Cole, D, Cords, A, Coleman, P, Corvisiero, D, Crabb, J P, Cummings, N, Dashyan, E De, Sanctis, R De, Vita, P V, Degtyarenko, H, Denizli, L, Dennis, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, P, Eugenio, R, Fatemi, R G, Fersch, R J, Feuerbach, T A, Forest, H, Funsten, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, C I O, Gordon, R W, Gothe, K, Griffioen, M, Guidal, M, Guillo, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, J, Hu, C E, Hyde-Wright, D G, Ireland, M M, Ito, D, Jenkins, K, Joo, H G, Juengst, J H, Kelley, J D, Kellie, M, Khandaker, D H, Kim, K Y, Kim, K, Kim, M S, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M V, Kossov, L H, Kramer, V, Kubarovski, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, G A, Leksin, T, Lee, Ji, Li, K, Livingston, K, Lukashin, J J, Manak, C, Marchand, S, McAleer, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, M D, Mestayer, C A, Meyer, M, Mirazita, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N A, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, S, Stepanyan, S S, Stepanyan, B E, Stokes, P, Stoler, I I, Strakovsky, M, Taiuti, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, A, Tkabladze, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, L S, Vorobeyev, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, and L, Zana
Subjects: INTERFEROMETRY, DRIFT CHAMBER, COLLISIONS, NUCLEI, CLAS, PARTICLES, SCATTERING, SPECTROMETER, SMALL RELATIVE MOMENTA, DRIFT CHAMBER, CLAS, NUCLEI, COLLISIONS, PARTICLES, INTERFEROMETRY, SPECTROMETER, CALORIMETER, SCATTERING, SMALL RELATIVE MOMENTA, CALORIMETER
Abstract: Two-proton correlations at small relative momentum q were studied in the eA(3He,4He,C,Fe)--e(')ppX reaction at E(0)=4.46 GeV using the CLAS detector at Jefferson Lab. The enhancement of the correlation function at small q was found to be in accordance with theoretical expectations. Sizes of the emission region were extracted, and proved to be dependent on A and on the proton momentum. The size of the two-proton emission region for He was measured in eA reactions for the first time.
Published: 2004

34. Measurement of beam-spin asymmetries for π+ electroproduction above the baryon resonance region

Author: K. V. Dharmawardane, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, M. Battaglieri, R. Bradford, B. A. Mecking, J. Hu, R. A. Miskimen, Clarisse Tur, D. Branford, M. Mirazita, J. M. Laget, G. Ricco, J. P. Santoro, Roy Thompson, R. J. Feuerbach, B. Carnahan, G. S. Adams, K. A. Griffioen, K. Joo, Philip L. Cole, J. P. Cummings, F. Sabatié, Jing Zhao, E. DeSanctis, M. Kossov, I. I. Strakovsky, P. Heimberg, J. D. Kellie, F. W. Hersman, Thierry Auger, W. Kim, M. Spraker, C. Cetina, D. I. Sober, Rakhsha Nasseripour, R. S. Hicks, R. A. Schumacher, Brian Raue, P. Eugenio, M. Taiuti, Michael Vineyard, A.V. Stavinsky, V. Gyurjyan, N. Benmouna, M. Ripani, K. Livingston, B. M. Preedom, L. Ciciani, Carlos A. Salgado, J. Lachniet, M. M. Ito, Daniel S. Carman, V. Sapunenko, R. Fatemi, Valeria Muccifora, W. K. Brooks, D. Rowntree, D. J. Tedeschi, G. Audit, S. Simionatto, L. C. Smith, A. V. Vlassov, C. E. Hyde-Wright, G. S. Mutchler, H. Bagdasaryan, S. J. Gaff, J. W. Price, Min Suk Kim, Gerard Gilfoyle, L. Guo, M. Ungaro, K. Y. Kim, H. Egiyan, J. J. Melone, K. L. Giovanetti, B. Asavapibhop, L. M. Qin, D. S. Armstrong, K. Wang, G. A. Peterson, Laird Kramer, Larry Weinstein, J. R. Calarco, D. Doughty, R. S. Hakobyan, Andreas Klein, Shalev Gilad, S. Barrow, Alexei V. Klimenko, Y. Ilieva, C. S. Whisnant, D. Heddle, Barry Ritchie, C. I O Gordon, M. Nozar, L. Morand, Ji Li, M. Bektasoglu, U. Thoma, M. Klusman, A. Longhi, J. Yun, D. Cords, Federico Ronchetti, A. Yegneswaran, E. Wolin, T. A. Forest, M. D. Mestayer, J. J. Manak, S. Stepanyan, A. Coleman, P. Dragovitsch, J. P. Ball, Y. Prok, M. Eckhause, H. R. Weller, E. Anciant, Nicola Bianchi, Andrei Afanasev, M. Sargsyan, H. Denizli, Baile Zhang, S. Niccolai, Sylvain Bouchigny, S. Boiarinov, L. Todor, D. Protopopescu, M. Khandaker, K. Park, D. G. Crabb, M. Guillo, A. K. Opper, J. Hardie, P. Rossi, S. Pozdniakov, M. Osipenko, Z. L. Zhou, A. V. Skabelin, Volker D. Burkert, A. S. Biselli, O. P. Dzyubak, R. A. Niyazov, Y. Kuang, K. Beard, Latifa Elouadrhiri, S. Mehrabyan, G. E. Dodge, R. C. Minehart, E. Polli, C. A. Meyer, Dinko Pocanic, P. V. Degtyarenko, K. Kim, P. Corvisiero, G. Riccardi, G. Gavalian, S. E. Kuhn, D. P. Weygand, M. Guidal, G. Niculescu, Daijin Kim, C. Butuceanu, J. H. Kelley, M. Holtrop, Stephen Taylor, B. B. Niczyporuk, Elton Smith, J. R. Ficenec, N. Pivnyuk, I. Niculescu, K. Lukashin, P. Stoler, M. Anghinolfi, J. Napolitano, D. Lawrence, James Mueller, Y. G. Sharabian, S. O. Nelson, K. Hicks, Hall Crannell, R. DeVita, J. W C McNabb, C. Marchand, S. A. Morrow, P. Rubin, C. Djalali, K. S. Egiyan, P. Ambrozewicz, K. Mikhailov, S. McAleer, S. Strauch, G. V. O'Rielly, D. G. Jenkins, K. Sabourov, M. Bellis, V. P. Kubarovsky, A. Empl, O. Pogorelko, Frank Klein, Patrick Girard, J. Shaw, Michael Wood, V. S. Serov, L. C. Dennis, B. E. Bonner, H. Avakian, E. Pasyuk, and S. A. Dytman
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, Resonance, Virtual particle, Nuclear physics, Momentum, Baryon, Amplitude, Pion, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Spin-½
Abstract: We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction ep→e'pi(+)X have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the sin phi modulation increases with the momentum of the pion relative to the virtual photon, z. In the range z=0.5-0.8 the average amplitude is 0.038+/-0.005+/-0.003 for a missing mass M-X gt 1.1 GeV and 0.037+/-0.007+/-0.004 for M-X gt 1.4 GeV
Published: 2004

35. ep→epπ0reaction studied in theΔ(1232)mass region using polarization asymmetries

Author: A. Biselli, G. S. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, W. Bertozzi, N. Bianchi, S. Boiarinov, B. E. Bonner, P. Bosted, S. Bouchigny, R. Bradford, D. Branford, W. K. Brooks, S. Bueltmann, V. D. Burkert, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, E. De Sanctis, R. De Vita, P. V. Degtyarenko, R. A. Demirchyan, H. Denizli, L. C. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, J. Domingo, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, Y. V. Efremenko, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, K. Fissum, T. A. Forest, A. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, G. Gavalian, V. B. Gavrilov, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, K. A. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, D. Hanock, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, G. A. Leksin, A. Longhi, K. Loukachine, R. W. Major, J. J. Manak, C. Marchand, S. K. Matthews, S. McAleer, J. W. C. McNabb, J. McCarthy, B. A. Mecking, M. D. Mestayer, C. A. Meyer, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, V. Muccifora, J. Mueller, L. Y. Murphy, G. S. Mutchler, J. Napolitano, S. O. Nelson, G. Niculescu, B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O’Brien, G. V. O’Rielly, M. S. Ohandjanyan, M. Osipenko, K. Park, Y. Patois, G. A. Peterson, S. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. W. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. M. Shuvalov, S. Simionatto, A. Skabelin, E. S. Smith, L. C. Smith, T. Smith, D. I. Sober, L. Sorrell, M. Spraker, S. Stepanyan, P. Stoler, I. I. Strakovsky, M. Taiuti, S. Taylor, D. Tedeschi, U. Thoma, R. Thompson, L. Todor, T. Y. Tung, C. Tur, M. Ungaro, M. F. Vineyard, A. Vlassov, K. Wang, L. B. Weinstein, H. Weller, R. Welsh, D. P. Weygand, S. Whisnant, M. Witkowski, E. Wolin, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou
Subjects: Physics, Delta, Nuclear and High Energy Physics, Range (particle radiation), media_common.quotation_subject, Polarization (waves), Asymmetry, Nuclear physics, Effective lagrangian, Isobar, High Energy Physics::Experiment, Nuclear Experiment, Spin (physics), media_common
Abstract: Measurements of the angular distributions of target and double spin asymmetries for the Delta(1232) in the exclusive channel (polarized-p polarized-e,e-prime p)pi0 obtained at Jefferson Lab in the Q2 range from 0.5 to 1.5 gev2 are presented. Results of the asymmetries are compared with the unitary isobar model, dynamical models, and the effective Lagrangian theory. Sensitivity to the different models was observed, particularly in relation to the description of background terms on which the target asymmetry depends significantly.
Published: 2003

36. First Measurement of Transferred Polarization in the Exclusivee→p→e′K+Λ→Reaction

Author: L. Guo, M. Ungaro, R. Fatemi, D. S. Armstrong, A. V. Vlassov, R. C. Minehart, C. A. Meyer, G. V. Fedotov, C. Bennhold, A. Coleman, H. R. Weller, V. Sapunenko, Valeria Muccifora, J. Yun, D. Cords, L. Elouadrhiri, D. P. Weygand, Baile Zhang, J. J. Manak, S. A. Morrow, A. Yegneswaran, Gerard Gilfoyle, M. Eckhause, C. Djalali, J. P. Cummings, Susan Taylor, A. K. Opper, P. Dragovitsch, H. Egiyan, H. Denizli, Laird Kramer, R. A. Miskimen, M. Kossov, P. Ambrozewicz, Rakhsha Nasseripour, R. A. Schumacher, S. Niccolai, A. V. Skabelin, Y. Kuang, D. Branford, L. Ciciani, G. S. Adams, K. S. Egiyan, M. Mirazita, J. M. Laget, S. Stepanyan, Sylvain Bouchigny, L. C. Smith, J. Hardie, S. J. Gaff, S. Simionatto, Alexei V. Klimenko, C. S. Whisnant, E. Polli, K. Joo, B. S. Ishkhanov, L. Todor, D. Protopopescu, K. Mikhailov, P. Rossi, Barry Ritchie, K. L. Giovanetti, B. Asavapibhop, S. Pozdniakov, M. Garçon, A. Cazes, M. U. Mozer, M. Guidal, C. Cetina, E. DeSanctis, W. K. Brooks, B. B. Niczyporuk, A.V. Stavinsky, Jing Zhao, M. Spraker, Larry Weinstein, Michael Vineyard, C. I O Gordon, Z. L. Zhou, G. Niculescu, K. V. Dharmawardane, D. J. Tedeschi, Dinko Pocanic, S. E. Kuhn, N. Pivnyuk, J. Napolitano, M. Holtrop, U. Thoma, E. Anciant, Ji Li, J. R. Calarco, L. Morand, K. A. Griffioen, J. H. Kelley, G. V. O'Rielly, T. A. Forest, C. Tur, O. P. Dzyubak, R. A. Niyazov, K. Livingston, M. Khandaker, J. Lachniet, D. G. Jenkins, K. Sabourov, M. D. Mestayer, K. Paschke, D. Rowntree, P. Corvisiero, V. Gyurjyan, Elton Smith, Daniel S. Carman, S. Mehrabyan, S. McAleer, D. Doughty, D. Heddle, S. Boiarinov, Terry Mart, D. I. Sober, Avraham Klein, R. J. Feuerbach, J. R. Ficenec, M. M. Ito, B. M. Preedom, G. Audit, C. E. Hyde-Wright, J. W C McNabb, G. E. Dodge, M. Anghinolfi, R. S. Hakobyan, P. Stoler, James Mueller, J. P. Santoro, J. W. Price, P. D. Rubin, H. Bagdasaryan, J. Hu, E. N. Golovach, G. A. Peterson, S. O. Nelson, P. V. Degtyarenko, K. Hicks, Y. G. Sharabian, M. Bektasoglu, K. Wang, C. Salgado, M. Battaglieri, M. Guillo, S. Barrow, I. Niculescu, D. Lawrence, R. Bradford, B. A. Mecking, Hall Crannell, C. Marchand, Kwangsoo Kim, M. Ripani, G. Riccardi, Cynthia Marie Hadjidakis, Jens H. Kuhn, C. Butuceanu, Michael Dugger, Nicola Bianchi, H. O. Funsten, W. Kim, M. Bellis, K. Park, J. S. McCarthy, K. Y. Kim, A. Longhi, R. Clark, L. Y. Murphy, A. Empl, O. Pogorelko, K. Lukashin, G. Ricco, Philip L. Cole, M. Osipenko, E. Wolin, F. Sabatié, Moshe Gai, F. W. Hersman, Friedrich Klein, K. Beard, M. Nozar, R. S. Hicks, Brian Raue, Kalvir S. Dhuga, Patrick Girard, J. Shaw, Michael Wood, Steven M. Grimes, G. Gavalian, V. Mokeev, J. P. Ball, Federico Ronchetti, Roy Thompson, Y. Prok, V. S. Serov, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, P. Eugenio, M. Taiuti, S. A. Dytman, J. J. Melone, D. G. Crabb, Volker D. Burkert, A. S. Biselli, G. S. Mutchler, L. M. Qin, R. DeVita, Shalev Gilad, M. Klusman, B. Carnahan, P. Heimberg, J. D. Kellie, and Thierry Auger
Subjects: Physics, Quark, Particle physics, Spectrometer, Spins, Nuclear Theory, Quark model, Hyperon, General Physics and Astronomy, Creation and annihilation operators, Particle accelerator, Polarization (waves), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The first measurements of the transferred polarization for the exclusive (e) over right arrow p --> e'K+(U) over right arrow reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q(2) from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the s (s) over bar quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.
Published: 2003

37. Measurement of inclusive spin structure functions of the deuteron

Author: J. Yun, S. E. Kuhn, G. E. Dodge, T. A. Forest, M. Taiuti, G. S. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, P. Bosted, S. Bouchigny, R. Bradford, D. Branford, W. K. Brooks, S. Bueltmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, E. De Sanctis, R. De Vita, P. V. Degtyarenko, R. A. Demirchyan, H. Denizli, L. C. Dennis, K. V. Dharmawardane, C. Djalali, J. Domingo, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, Y. V. Efremenko, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, K. Fissum, A. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, G. Gavalian, V. B. Gavrilov, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, C. I. O. Gordon, K. A. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, C. Keith, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, G. A. Leksin, K. Loukachine, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. W. C. McNabb, J. McCarthy, B. A. Mecking, M. D. Mestayer, C. A. Meyer, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, V. Muccifora, J. Mueller, L. Y. Murphy, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, G. Niculescu, B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. S. Ohandjanyan, A. Opper, M. Ossipenko, K. Park, Y. Patois, G. A. Peterson, S. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. W. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. M. Shuvalov, S. Simionatto, A. Skabelin, E. S. Smith, L. C. Smith, T. Smith, D. I. Sober, L. Sorrell, M. Spraker, S. Stepanyan, P. Stoler, S. Taylor, D. Tedeschi, U. Thoma, R. Thompson, L. Todor, T. Y. Tung, C. Tur, M. F. Vineyard, A. Vlassov, K. Wang, L. B. Weinstein, H. Weller, R. Welsh, D. P. Weygand, S. Whisnant, M. Witkowski, E. Wolin, M. H. Wood, A. Yegneswaran, B. Zhang, J. Zhao, Z. Zhou, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Robert, Suzanne
Subjects: Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, FOS: Physical sciences, Spin structure, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Deuterium, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We report the results of a new measurement of spin structure functions of the deuteron in the region of moderate momentum transfer ($Q^2$ = 0.27 -- 1.3 (GeV/c)$^2$) and final hadronic state mass in the nucleon resonance region ($W$ = 1.08 -- 2.0 GeV). We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target ($^{15}$ND$_3$) and detected the scattered electrons with the CEBAF Large Acceptance Spectrometer (CLAS). From our data, we extract the longitudinal double spin asymmetry $A_{||}$ and the spin structure function $g_1^d$. Our data are generally in reasonable agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function $g_1^d$ and study its approach to both the deep inelastic limit at large $Q^2$ and to the Gerasimov-Drell-Hearn sum rule at the real photon limit ($Q^2 \to 0$). We find that the first moment varies rapidly in the $Q^2$ range of our experiment and crosses zero at $Q^2$ between 0.5 and 0.8 (GeV/c)$^2$, indicating the importance of the $\Delta$ resonance at these momentum transfers., Comment: 13 pages, 8 figures, ReVTeX 4, final version as accepted by Phys. Rev. C
Published: 2003

38. First measurement of transferred polarization in the exclusive ep--e'K+Lambda--reaction

Author: D S, Carman, K, Joo, M D, Mestayer, B A, Raue, G, Adams, P, Ambrozewicz, E, Anciant, M, Anghinolfi, D S, Armstrong, B, Asavapibhop, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S P, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, M, Bellis, C, Bennhold, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, V D, Burkert, C, Butuceanu, J R, Calarco, B, Carnahan, A, Cazes, C, Cetina, L, Ciciani, R, Clark, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, DeSanctis, P V, Degtyarenko, H, Denizli, L, Dennis, R, DeVita, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, O P, Dzyubak, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, P, Eugenio, R, Fatemi, G, Fedotov, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, E, Golovach, C I O, Gordon, K, Griffioen, S, Grimes, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B, Ishkhanov, M M, Ito, D, Jenkins, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, J, Li, K, Livingston, A, Longhi, K, Lukashin, J J, Manak, C, Marchand, T, Mart, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, M U, Mozer, V, Muccifora, J, Mueller, L Y, Murphy, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, A K, Opper, M, Osipenko, K, Park, K, Paschke, E, Pasyuk, G, Peterson, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, M, Taiuti, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The first measurements of the transferred polarization for the exclusive e--p--e(')K+Lambda--reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q2 from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the ssmacr; quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.
Published: 2002

39. Publisher’s Note:ηPhotoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV [Phys. Rev. Lett.89, 222002 (2002)]

Author: V. V. Frolov, D. Doughty, R. A. Niyazov, John T. O'Brien, D. Heddle, Barry Ritchie, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, P. Dragovitsch, K. A. Griffioen, G. E. Dodge, M. Lucas, P. Corvisiero, D. Hancock, E. S. Smith, Sylvain Bouchigny, P. Rossi, P. V. Degtyarenko, S. Niccolai, Carlos A. Salgado, L. Elouadrhiri, G. Ricco, J. Hardie, K. S. Egiyan, Baile Zhang, R. C. Minehart, C. A. Meyer, G. S. Mutchler, V. Koubarovski, K. Mikhailov, G. Gavalian, A. K. Opper, I. Niculescu, M. M. Ito, I. I. Strakovsky, A.V. Stavinsky, D. Lawrence, M. Spraker, C. Cetina, H. Egiyan, G. V. O'Rielly, E. Wolin, Michael Vineyard, J. P. Cummings, D. P. Weygand, L. Farhi, Y. Kuang, D. J. Tedeschi, C. S. Whisnant, D. G. Jenkins, K. Sabourov, G. P. Capitani, E. Polli, William Brooks, G. S. Adams, R. DeVita, J. W C McNabb, Ji Li, H. Denizli, Hall Crannell, M. U. Mozer, P. Heimberg, M. Witkowski, K. V. Dharmawardane, A. Coleman, P. L. Cole, Cynthia Marie Hadjidakis, Andreas Klein, J. R. Ficenec, S. McAleer, J. D. Kellie, P. Stoler, J. Lachniet, H. R. Weller, M. Kossov, J. R. Calarco, C. Marchand, M. D. Mestayer, J. J. Manak, D. Rowntree, M. Anghinolfi, James Mueller, Michael Dugger, J. Connelly, A. V. Skabelin, K. S. Dhuga, D. Pogorelko, H. O. Funsten, S. O. Nelson, Y. G. Sharabian, Frank Klein, L. C. Smith, Rakhsha Nasseripour, S. J. Gaff, K. Hicks, M. Sanzone-Arenhovel, R. A. Schumacher, S. Boiarinov, B. B. Niczyporuk, B. M. Preedom, S. Strauch, S. A. Philips, W. Kim, N. Pivnyuk, C. I O Gordon, K. Lukashin, J. Napolitano, Moshe Gai, Dinko Pocanic, M. Battaglieri, Shalev Gilad, M. Nozar, S. E. Kuhn, L. Morand, T. A. Forest, B. Carnahan, F. Sabatié, K. L. Giovanetti, B. Asavapibhop, J. H. Kelley, Stephen Taylor, J. P. Ball, Y. Prok, Patrick Girard, R. Bradford, B. A. Mecking, Larry Weinstein, Gerald Feldman, J. Shaw, S. Stepanyan, D. S. Carman, Jens H. Kuhn, A. Longhi, E. Anciant, K. Wang, U. Thoma, Nicola Bianchi, Thierry Auger, Michael Wood, R. S. Hicks, Brian Raue, K. Livingston, V. S. Serov, L. C. Dennis, M. Khandaker, G. Audit, M. Ripani, M. Guillo, C. E. Hyde-Wright, B. L. Berman, L. M. Qin, H. Avakian, R. J. Feuerbach, K. Beard, M. Klusman, D. G. Crabb, G. A. Peterson, W. Major, M. Bektasoglu, S. Barrow, M. Guidal, G. Niculescu, W. J. Briscoe, E. Pasyuk, Federico Ronchetti, M. Holtrop, Thomas E. Smith, S. A. Dytman, L. Todor, J. S. McCarthy, M. Bellis, D. Protopopescu, L. Y. Murphy, S. Pozdniakov, S. Mehrabyan, Z. L. Zhou, R. Clark, A. Shafi, G. Riccardi, J. P. Santoro, Roy Thompson, Jing Zhao, M. Taiuti, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, F. W. Hersman, R. A. Miskimen, D. Branford, M. Mirazita, J. M. Laget, Laird Kramer, R. Fatemi, A. V. Vlassov, K. Park, D. I. Sober, Volker D. Burkert, A. S. Biselli, L. Guo, M. Ungaro, K. Joo, J. Yun, D. Cords, A. Yegneswaran, E. DeSanctis, V. Gyurjyan, H. Bagdasaryan, and J. W. Price
Subjects: Physics, Nuclear physics, Photon, Proton, General Physics and Astronomy
Published: 2002

40. Measurement of ep--e' ppi+ pi- and baryon resonance analysis

Author: M, Ripani, V D, Burkert, V, Mokeev, M, Battaglieri, R, De Vita, E, Golovach, M, Taiuti, G, Adams, E, Anciant, M, Anghinolfi, B, Asavapibhop, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, K, Beard, M, Bektasoglu, M, Bellis, B L, Berman, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, J R, Calarco, D S, Carman, B, Carnahan, A, Cazes, C, Cetina, L, Ciciani, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, P V, Degtyarenko, H, Denizli, L, Dennis, K V, Dharmawardane, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, K, Griffioen, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B, Ishkhanov, M M, Ito, D, Jenkins, K, Joo, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, Ji, Li, K, Livingston, A, Longhi, K, Lukashin, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, L, Morand, S A, Morrow, M U, Mozer, V, Muccifora, J, Mueller, L Y, Murphy, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, A K, Opper, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B, Quinn, B A, Raue, G, Riccardi, G, Ricco, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The cross section for the reaction ep--e(')ppi(+)pi(-) was measured in the resonance region for 1.4W2.1 GeV and 0.5Q21.5 GeV(2)/c(2) using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N(*) and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
Published: 2002

41. Erratum: First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region [Phys. Rev. Lett. 88, 082001 (2002)]

Author: R. De Vita, M. Anghinolfi, V. D. Burkert, G. E. Dodge, R. Minehart, M. Taiuti, H. Weller, G. Adams, M. J. Amaryan, E. Anciant, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, P. Bosted, S. Bouchigny, D. Branford, W. K. Brooks, S. Bueltmann, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, K. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, B. S. Ishkanov, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, K. Livingston, A. Longhi, K. Loukachine, M. Lucas, W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, A. K. Opper, G. V. O'Rielly, M. Osipenko, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, L. Sorrell, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Taylor, D. J. Tedeschi, R. Thompson, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, A. Weisberg, D. P. Weygand, C. S. Whisnant, E. Wolin, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou
Subjects: Physics, media_common.quotation_subject, Pi, General Physics and Astronomy, Resonance, Angular dependence, Atomic physics, Spin (physics), Asymmetry, Helicity, media_common
Published: 2002

42. First measurement of the double spin asymmetry in (--)e(--)p--e(prime)pi(+)n in the resonance region

Author: R, De Vita, M, Anghinolfi, V D, Burkert, G E, Dodge, R, Minehart, M, Taiuti, H, Weller, G, Adams, M J, Amaryan, E, Anciant, D S, Armstrong, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, P, Bosted, S, Bouchigny, D, Branford, W K, Brooks, S, Bueltmann, J R, Calarco, G P, Capitani, D S, Carman, B, Carnahan, A, Cazes, L, Ciciani, P L, Cole, A, Coleman, J, Connelly, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, P V, Degtyarenko, R, Demirchyan, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, L, Farhi, R, Fatemi, R J, Feuerbach, J, Ficenec, T A, Forest, V, Frolov, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, E, Golovatch, K, Griffioen, M, Guidal, M, Guillo, V, Gyurjyan, C, Hadjidakis, D, Hancock, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B S, Ishkanov, M M, Ito, D, Jenkins, K, Joo, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, Ji, Li, K, Livingston, A, Longhi, K, Loukachine, M, Lucas, W, Major, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, M, Mirazita, R, Miskimen, V, Mokeev, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, S O, Nelson, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, A K, Opper, G V, O'Rielly, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, A R, Reolon, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, S, Rock, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, V, Sapunenko, M, Sargsyan, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, A V, Skabelin, E S, Smith, T, Smith, L C, Smith, D I, Sober, L, Sorrell, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Taylor, D J, Tedeschi, R, Thompson, L, Todor, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, A, Weisberg, D P, Weygand, C S, Whisnant, E, Wolin, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The double spin asymmetry in the (--)e(--)p --e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
Published: 2001

43. Corrected Article: Exclusive electroproduction of φ mesons at 4.2 GeV [Phys. Rev. C63, 065205 (2001)]

Author: J. Domingo, R. A. Schumacher, R. A. Niyazov, John T. O'Brien, G. S. Mutchler, H. O. Funsten, Dinko Pocanic, E. S. Smith, A. Coleman, H. R. Weller, M. D. Mestayer, J. J. Manak, S. E. Kuhn, P. Corvisiero, S. McAleer, J. H. Kelley, Stephen Taylor, Sylvain Bouchigny, P. Rossi, T. A. Forest, S. Stepanyan, K. S. Dhuga, G. Gavalian, S. Boiarinov, J. R. Ficenec, M. Anghinolfi, K. A. Griffioen, J. R. Calarco, S. A. Philips, L. C. Dennis, B. E. Bonner, H. Avakian, K. S. Egiyan, M. M. Ito, Laird Kramer, B. B. Niczyporuk, Jing Zhao, James Mueller, L. C. Smith, S. J. Gaff, K. Mikhailov, Shalev Gilad, G. E. Dodge, J. S. McCarthy, M. Taiuti, R. Fatemi, Y. G. Sharabian, J. Hu, M. Ripani, N. Pivnyuk, K. Lukashin, J. Napolitano, E. Wolin, Michael Vineyard, P. Dragovitsch, G. V. O'Rielly, Baile Zhang, M. Guidal, A. K. Opper, W. J. Briscoe, E. Pasyuk, M. Battaglieri, A. V. Vlassov, D. G. Jenkins, K. Park, B. A. Mecking, J. P. Ball, D. S. Carman, P. Rubin, M. Eckhause, H. Egiyan, C. Djalali, S. Whisnant, B. M. Preedom, K. Sabourov, G. Niculescu, J. P. Cummings, L. M. Qin, S. A. Dytman, R. A. Miskimen, Volker D. Burkert, A. S. Biselli, D. G. Crabb, J. Hardie, V. Gyurjyan, E. Polli, P. Stoler, Kevin Fissum, M. Holtrop, A.V. Stavinsky, D. Branford, M. Guillo, M. Kossov, M. Mirazita, S. O. Nelson, K. Wang, W. Kim, J. M. Laget, S. Pozdniakov, L. Elouadrhiri, D. J. Tedeschi, K. Hicks, C. Salgado, Robert E. Welsh, Roy Thompson, K. Paschke, I. I. Strakovsky, Z. L. Zhou, M. Klusman, Andreas Klein, V. Sapunenko, Valeria Muccifora, J. W. Price, Kwangsoo Kim, G. Riccardi, A. Longhi, G. S. Adams, R. Clark, Gerard Gilfoyle, R. DeVita, J. W C McNabb, A. Empl, Pavel Degtiarenko, E. De Sanctis, G. Audit, O. Pogorelko, C. E. Hyde-Wright, D. I. Sober, R. J. Feuerbach, K. Beard, Frank Klein, G. A. Peterson, S. Barrow, M. Bektasoglu, K. Joo, Patrick Girard, J. Shaw, J. Yun, D. Cords, A. Yegneswaran, Nicola Bianchi, B. Carnahan, F. Sabatié, V. S. Serov, Thierry Auger, A. R. Reolon, A. P. Freyberger, Federico Ronchetti, G. Ricco, Moshe Gai, R. S. Hicks, Brian Raue, Barry Ritchie, R. C. Minehart, C. A. Meyer, L. Ciciani, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, William Bertozzi, E. Anciant, M. Khandaker, D. P. Weygand, D. Doughty, D. Heddle, A. V. Skabelin, K. Kim, I. Niculescu, D. Lawrence, William Brooks, Hall Crannell, C. Marchand, D. Rowntree, L. Yanik, P. L. Cole, and F. W. Hersman
Subjects: Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Meson production, Proton, Meson, Vector meson dominance, Production (computer science), HERA
Abstract: We studied the exclusive reaction $e\stackrel{\ensuremath{\rightarrow}}{p}{e}^{\ensuremath{'}}{p}^{\ensuremath{'}}\ensuremath{\varphi}$ using the $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\varphi}}{K}^{+}{K}^{\ensuremath{-}}$ decay mode. The data were collected using a 4.2 GeV incident electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. Our experiment covers the range in ${Q}^{2}$ from 0.7 to 2.2 ${\mathrm{GeV}}^{2},$ and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of $\ensuremath{\varphi}$ production on the proton. Our measurement shows the expected decrease of the t slope with the vector-meson formation time $c\ensuremath{\Delta}\ensuremath{\tau}$ below 2 fm. At $〈c\ensuremath{\Delta}\ensuremath{\tau}〉=0.6$ fm, we measure ${b}_{\ensuremath{\varphi}}=2.27\ifmmode\pm\else\textpm\fi{}0.42$ ${\mathrm{GeV}}^{\ensuremath{-}2}.$ The cross section dependence on W as ${W}^{0.2\ifmmode\pm\else\textpm\fi{}0.1}$ at ${Q}^{2}=1.3$ ${\mathrm{GeV}}^{2}$ was determined by comparison with $\ensuremath{\varphi}$ production at HERA after correcting for threshold effects. This is the same dependence as observed in photoproduction.
Published: 2001

44. Photoproduction of theρ0Meson on the Proton at Large Momentum Transfer

Author: V. Frolov, M. J. Amaryan, V. Mokeev, A. Cazes, J. P. Cummings, R. De Vita, P. Dragovitsch, Roy Thompson, R. Demirchyan, K. V. Dharmawardane, G. Asryan, R. A. Niyazov, M. Kossov, Volker D. Burkert, A. S. Biselli, J. Hardie, K. L. Giovanetti, B. Asavapibhop, R. A. Miskimen, John T. O'Brien, M. Spraker, Larry Weinstein, Laird Kramer, G. S. Adams, B. L. Berman, P. Corvisiero, G. Riccardi, M. Taiuti, M. Battaglieri, Susan Taylor, L. M. Qin, K. Joo, K. Beard, E. Anciant, L. Todor, D. Protopopescu, Kalvir S. Dhuga, K. S. Egiyan, B. A. Mecking, J. R. Calarco, A.V. Stavinsky, M. Klusman, M. M. Ito, H. Egiyan, W. Kim, R. W. Major, E. Wolin, J. W C McNabb, A. P. Freyberger, K. Mikhailov, D. J. Tedeschi, M. Khandaker, D. Branford, K. A. Griffioen, M. Mirazita, Z. L. Zhou, A. Shafi, Dinko Pocanic, L. Farhi, M. Sanzone-Arenhovel, Federico Ronchetti, J. M. Laget, B. B. Niczyporuk, D. Doughty, Shalev Gilad, B. Carnahan, G. Ricco, D. G. Crabb, N. Pivnyuk, D. Heddle, C. S. Whisnant, S. E. Kuhn, J. Napolitano, P. Stoler, A. Coleman, Philip L. Cole, H. R. Weller, Thierry Auger, A. Weisberg, A. R. Reolon, Moshe Gai, K. Sabourov, S. O. Nelson, J. Shaw, K. Hicks, M. Eckhause, P. Rossi, C. Djalali, Michael Wood, M. Lucas, R. J. Feuerbach, Friedrich Klein, R. S. Hicks, Brian Raue, V. S. Serov, V. Sapunenko, Valeria Muccifora, Michael Dugger, J. H. Kelley, F. W. Hersman, H. O. Funsten, M. Guillo, S. McAleer, J. S. McCarthy, A. V. Vlassov, Gerard Gilfoyle, O. Pogorelko, K. Lukashin, L. C. Dennis, L. C. Smith, S. J. Gaff, Nicola Bianchi, H. Avakian, L. Elouadrhiri, G. S. Mutchler, Jing Zhao, W. J. Briscoe, M. Ripani, S. A. Dytman, Elton Smith, E. N. Golovach, G. A. Peterson, W. K. Brooks, S. Barrow, J. R. Ficenec, D. S. Armstrong, M. Anghinolfi, J. Yun, D. Cords, James Mueller, A. Yegneswaran, P. D. Rubin, Y. G. Sharabian, E. DeSanctis, Baile Zhang, J. J. Manak, A. K. Opper, Y. Kuang, V. Gyurjyan, E. Polli, D. I. Sober, J. W. Price, D. Hancock, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, D. P. Weygand, Barry Ritchie, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, S. A. Philips, M. Guidal, M. D. Mestayer, M. Holtrop, Thomas E. Smith, S. Boiarinov, R. A. Schumacher, T. A. Forest, S. Stepanyan, Avraham Klein, Hall Crannell, C. Cetina, C. Marchand, G. E. Dodge, Michael Vineyard, B. M. Preedom, P. V. Degtyarenko, D. Lawrence, G. P. Capitani, C. Salgado, and D. Rowntree
Subjects: Nuclear physics, Physics, Proton, Meson, Momentum transfer, General Physics and Astronomy
Published: 2001

45. Photoproduction of the rho(0) meson on the proton at large momentum transfer

Author: M, Battaglieri, E, Anciant, M, Anghinolfi, R, De Vita, E, Golovach, J M, Laget, V, Mokeev, M, Ripani, G, Adams, M J, Amaryan, D S, Armstrong, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, S, Barrow, K, Beard, M, Bektasoglu, B L, Berman, N, Bianchi, A S, Biselli, S, Boiarinov, D, Branford, W J, Briscoe, W K, Brooks, V D, Burkert, J R, Calarco, G P, Capitani, D S, Carman, B, Carnahan, A, Cazes, C, Cetina, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, DeSanctis, P V, Degtyarenko, R, Demirchyan, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, L, Farhi, R J, Feuerbach, J, Ficenec, T A, Forest, A P, Freyberger, V, Frolov, H, Funsten, S J, Gaff, M, Gai, S, Gilad, G P, Gilfoyle, K L, Giovanetti, K, Griffioen, M, Guidal, M, Guillo, V, Gyurjyan, D, Hancock, J, Hardie, D, Heddle, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, C E, Hyde-Wright, M M, Ito, K, Joo, J H, Kelley, M, Khandaker, W, Kim, A, Klein, F J, Klein, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, D, Lawrence, M, Lucas, K, Lukashin, R W, Major, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, S O, Nelson, B B, Niczyporuk, R A, Niyazov, J T, O'Brien, A K, Opper, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, B M, Preedom, J W, Price, D, Protopopescu, L M, Qin, B A, Raue, A R, Reolon, G, Riccardi, G, Ricco, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, K, Sabourov, C, Salgado, M, Sanzone-Arenhovel, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, A V, Skabelin, E S, Smith, T, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, M, Taiuti, S, Taylor, D J, Tedeschi, L, Todor, R, Thompson, M F, Vineyard, A V, Vlassov, L B, Weinstein, A, Weisberg, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The differential cross section, d sigma/dt, for rho(0) meson photoproduction on the proton above the resonance region was measured up to a momentum transfer -t = 5 GeV2 using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The rho(0) channel was extracted from the measured two charged-pion cross sections by fitting the pi(+)pi(-) and p pi(+) invariant masses. The low momentum transfer region shows the typical diffractive pattern expected from Reggeon exchange. The flatter behavior at large -t cannot be explained solely in terms of QCD-inspired two-gluon exchange models. The data indicate that other processes, like quark interchange, are important to fully describe rho photoproduction.
Published: 2001

46. CLAS electro-omega production

Author: B. A. Mecking, A. Larabee, Franz Klein, A. Coleman, H. O. Funsten, and Volker D. Burkert
Subjects: Baryon, Nuclear physics, Physics, Meson, Proton, Phase space, Nuclear Theory, High Energy Physics::Experiment, Electron, Nuclear Experiment, Nucleon, Omega, Coincidence
Abstract: Electroproduction of ω(783) mesons from a proton target has been measured at CLAS in a search for so called “missing” baryon resonances. Scattered electrons were measured in coincidence with the recoiling proton and a π+ from the ω decay. Missing mass techniques were applied to identify the outgoing ω and to reduce the contributions of ρ(770) and 2 π final states. The resulting ep missing mass distributions clearly show an ω peak superimposed on a predominantly 3-pion phase space. Preliminary analysis indicates that t distributions monotonically decrease for W>2 GeV, as expected from pi-exchange and diffractive processes but for 1.8 GeV
Published: 2000

47. Electroexcitation of theΔ(1232) in nuclei

Author: D. G. Christian, J.P. Chen, J. Morgenstern, Donal Day, K. L. Giovanetti, L. C. Dennis, S.T. Thornton, R. M. Sealock, Z. E. Meziani, B. A. Mecking, S. Auffret, O. Rondon-Aramayo, K. W. Kemper, J. S. McCarthy, and R. C. Minehart
Subjects: Nuclear reaction, Nuclear physics, Baryon, Physics, Hadron, General Physics and Astronomy, Invariant mass, Elementary particle, Fermion, Atomic physics, Nuclear Experiment, Nucleon, Delta baryon
Abstract: Inclusive electron-scattering measurements of \ensuremath{\Delta} electroexcitation in nuclei are reported. Electrons with energies of 0.96, 1.1, 1.3, and 1.5 GeV were scattered from $^{1}\mathrm{H}$, $^{4}\mathrm{He}$, C Fe, and W at 37.5\ifmmode^\circ\else\textdegree\fi{}, corresponding to ${Q}^{2}$=0.20--0.52 (GeV/c${)}^{2}$ at the \ensuremath{\Delta} peak. The centroid of the \ensuremath{\Delta}-region cross-section peak is above that for the free nucleon and it shifts to higher invariant mass as ${Q}^{2}$ increases. The A dependence in the dip region and ratios of nuclear to nucleon integrated cross sections indicate that at these ${Q}^{2}$ values there is little specifically nuclear, e.g., quasideuteron, background contribution.
Published: 1989

48. A-dependence of deep-inelastic electron scattering from nuclei

Author: Peter Bosted, J. Gomez, A.T. Katramatou, C. C. Chang, B. A. Mecking, N. Giokaris, A. Bodek, R. G. Arnold, R. M. Lombard, and G. G. Petratos
Subjects: Physics, Nuclear reaction, Mass number, Scattering, Electron, Atomic physics, Inelastic scattering, Nucleon, Deep inelastic scattering, Nuclear density
Abstract: The deep inelastic electron scattering cross sections per nucleon sigma/sub A/ for d, He, Be, C, Al, Ca, Fe, Ag, and Au were measured in the kinematic range 0.09 less than or equal to x less than or equal to 0.9 and 2 less than or equal to Q/sup 2/ less than or equal to 15 (GEV/c)/sup 2/ using electrons with energies ranging from 8 to 24.5 GeV. The ratio sigma/sub A//sigma/sub d/ is consistent with unity in the range 0.1 < x < 0.3. For 0.3 < x < 0.8, the ratio decreases logarithmically with atomic weight A, or linearly with average nuclear density. No Q/sup 2/ dependence in the ratio was observed over the kinematic range of the data. 12 references.
Published: 1984

49. Observation of an Exotic Baryon with S = +1 in Photoproduction from the Proton

Author: L. C. Smith, S. J. Gaff, K. A. Griffioen, Elton Smith, J. R. Ficenec, R. A. Schumacher, G. Gavalian, V. Mokeev, M. Bellis, K. Park, M. Anghinolfi, B. L. Berman, L. M. Qin, James Mueller, P. D. Rubin, Y. G. Sharabian, C. I O Gordon, V. P. Kubarovsky, R. J. Feuerbach, J. Kuhn, Dinko Pocanic, S. E. Kuhn, J. H. Kelley, C. Tur, Roy Thompson, A. Empl, O. Pogorelko, K. Lukashin, M. Klusman, L. Morand, T. A. Forest, S. Stepanyan, E. De Sanctis, R. C. Minehart, C. A. Meyer, A. K. Opper, Shifeng Chen, D. I. Sober, P. Eugenio, M. Taiuti, L. C. Dennis, H. Avakian, P. Heimberg, B. M. Preedom, E. Polli, W. Kim, Daniel S. Carman, G. Audit, J. P. Santoro, P. Stoler, B. Carnahan, F. Sabatié, J. Hu, J. J. Melone, K. Wang, C. Salgado, D. P. Weygand, B. B. Niczyporuk, R. Fatemi, E. Wolin, G. E. Dodge, J. P. Cummings, H. Denizli, N. Pivnyuk, J. Napolitano, A. Longhi, Thierry Auger, A. V. Vlassov, S. O. Nelson, Ji Li, W. J. Briscoe, E. Pasyuk, M. D. Mestayer, M. Kossov, K. Hicks, J. R. Calarco, J. P. Ball, Y. Prok, S. A. Dytman, Susan Taylor, P. V. Degtyarenko, M. Sargsyan, Cynthia Marie Hadjidakis, S. Strauch, J. Connelly, A. V. Skabelin, S. Boiarinov, D. G. Crabb, Michael Dugger, Rakhsha Nasseripour, Alexei V. Klimenko, A. Weisberg, H. O. Funsten, K. S. Egiyan, R. DeVita, J. W C McNabb, M. Osipenko, C. Cetina, K. Mikhailov, Michael Vineyard, I. Niculescu, D. Lawrence, M. Guillo, Patrick Girard, C. S. Whisnant, J. Shaw, V. Gyurjyan, M. Nozar, Michael Wood, Barry Ritchie, K. Beard, M. U. Mozer, S. Mehrabyan, R. W. Major, L. Elouadrhiri, S. A. Morrow, C. Djalali, V. S. Serov, L. Farhi, J. J. Manak, P. Ambrozewicz, Sylvain Bouchigny, K. V. Dharmawardane, I. I. Strakovsky, P. Rossi, Kwangsoo Kim, G. Riccardi, G. S. Mutchler, M. Guidal, G. V. O'Rielly, G. Niculescu, O. P. Dzyubak, R. A. Niyazov, C. Butuceanu, H. Bagdasaryan, Hall Crannell, John T. O'Brien, N. Benmouna, C. Marchand, M. Ripani, D. Hancock, M. Battaglieri, P. Corvisiero, M. Holtrop, Thomas E. Smith, M. Ungaro, W. K. Brooks, R. Bradford, B. A. Mecking, D. G. Jenkins, K. Sabourov, K. Joo, J. Yun, D. Cords, A. Yegneswaran, G. S. Adams, S. McAleer, J. Langheinrich, S. A. Philips, U. Thoma, J. W. Price, M. M. Ito, Laird Kramer, E. Anciant, M. Bektasoglu, M. Khandaker, D. Doughty, F. W. Hersman, D. Heddle, Volker D. Burkert, A. S. Biselli, R. W. Gothe, K. Y. Kim, V. Frolov, L. Ciciani, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Hovanes Egiyan, M. Spraker, Larry Weinstein, R. A. Miskimen, H. G. Juengst, D. Branford, M. Mirazita, J. M. Laget, J. Lachniet, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, D. Rowntree, R. S. Hakobyan, Federico Ronchetti, Philip L. Cole, Friedrich Klein, Brian Raue, P. Dragovitsch, Y. Ilieva, S. Niccolai, J. Hardie, Lei Guo, A.V. Stavinsky, D. J. Tedeschi, Nicola Bianchi, G. A. Peterson, S. Barrow, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, A. Shafi, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Robert, Suzanne
Subjects: Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, POSITIVE-STRANGENESS, PENTAQUARK, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, PENTAQUARK, Pentaquark, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Exotic baryon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], POSITIVE-STRANGENESS, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: The reaction $\gamma p \to \pi^+K^-K^+n$ was studied at Jefferson Lab using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass $M=1555\pm 10$ MeV/c$^2$ was observed in the $nK^+$ invariant mass spectrum. The peak's width is consistent with the CLAS resolution (FWHM=26 MeV/c$^2$), and its statistical significance is 7.8 $\pm$ 1.0 ~$\sigma$. A baryon with positive strangeness has exotic structure and cannot be described in the framework of the naive constituent quark model. The mass of the observed state is consistent with the mass predicted by a chiral soliton model for the $\Theta^+$ baryon. In addition, the $pK^+$ invariant mass distribution was analyzed in the reaction $\gamma p\to K^-K^+p$ with high statistics in search of doubly-charged exotic baryon states. No resonance structures were found in this spectrum., Comment: 5 pages, 5 figures, add references

50. Photoproduction of the ω meson on the proton at large momentum transfer

Author: M. Battaglieri, M. Brunoldi, R. De Vita, J. M. Laget, M. Osipenko, M. Ripani, M. Taiuti, G. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, K. Beard, M. Bektasoglu, B. L. Berman, A. Bersani, N. Bianchi, A. S. Biselli, S. Boiarinov, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, C. Cetina, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. DeSanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, L. Farhi, R. J. Feuerbach, J. Ficenec, T. A. Forest, A. P. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garcon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, E. Golovach, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, C. E. Hyde-Wright, M. M. Ito, K. Joo, J. H. Kelley, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, S. E. Kuhn, J. Lachniet, D. Lawrence, M. Lucas, K. Lukashin, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, M. U. Mozer, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O’Brien, A. K. Opper, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, B. G. Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. Salgado, V. Sapunenko, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, S. Taylor, D. J. Tedeschi, L. Todor, U. Thoma, R. Thompson, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. Wood, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou
Subjects: Physics, Particle physics, Proton, Meson, Hadron, Momentum transfer, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Gluon, High Energy Physics - Experiment, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nucleon, Nuclear Experiment
Abstract: The differential cross section, $d\sigma/dt$ for $\omega$ meson exclusive photoproduction on the proton above the resonance region ($2.6, Comment: 5 pages, 5 figures

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